UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

Office of Air Quality Planning and Standards 

Research Triangle Park, NC 27711 

April 14, 2011 

MEMORANDUM

SUBJECT: PM10 and PM10-2.5 Air Quality Analyses 

FROM: Mark Schmidt, OAR/OAQPS/AQAD /s/ 

TO: PM NAAQS Review Docket EPA-OAR-2007-0492

Overview

 

This memorandum documents updates (since the analyses described in Schmidt and Jenkins, 2010) to 

PM10 and PM10-2.5 air quality analyses conducted to support the review of the Particulate Matter (PM) 

national ambient air quality standards (NAAQS). The purpose of these analyses is to inform staff 

conclusions on the current 24-hour PM10 standard as well as on potential alternative standards meant to 

protect against exposures to PM10-2.5. The following are presented in this memo: 

 Relationships between PM10 expected exceedance concentration-equivalent design values and 98th

percentile PM10 concentration design values 

 Comparison of the coefficients of variation for PM10 expected exceedance concentrationequivalent design values and 98th percentile PM10 concentration design values 

 U.S. counties with monitors, and the population sizes in those counties, not likely to meet the 

current PM10 standard as well as different potential alternative standards 

 Detailed distributions of PM10 air quality concentrations 

General data processing

As described in Schmidt and Jenkins (2010), the air quality data for this project originated from EPA’s 

Air Quality System (AQS) data base, the official repository of NAAQS-comparable ambient 

measurements. See Schmidt and Jenkins (2010) for more detail. 

Inter-Metric Comparability

The approach to comparing PM10 expected exceedance concentration-equivalent design values and 98th

percentile PM10 concentration design values is the same as that described in Schmidt and Jenkins (2010). 

When the national analysis described by Schmidt and Jenkins (2010) was conducted using air quality data 

from 1988 to 2008, a 98th percentile PM10 concentration design value of 87 μg/m3

 was generally 

equivalent to the current standard level (Schmidt and Jenkins, 2010). Regional relationships from this 

analysis are presented below. 

 
2

Figure 1: Regional 98th percentile PM10 concentration design values (y-axis) versus the PM10

expected exceedance concentration-equivalent design values (x-axis) using 1988-2008 data* 

*Bold regression lines reflect region-specific relationships between 98th percentile PM10 concentration design values and PM10

expected exceedance concentration-equivalent design values. Non-bolded regression lines reflect the overall relationship 

across all regions, as illustrated by Schmidt and Jenkins (2010). In some areas (i.e., southeast, upper Midwest, northwest, 

southwest, and southern California), the two regression lines are almost indistinguishable. Vertical lines mark the level of the 

current standard and horizontal lines mark a 98th percentile concentration of 87 μg/m3

. 
3

When the national analysis was repeated using only the most recent air quality data available (2007 to 

2009), a 98th percentile PM10 concentration design value of 78 μg/m3

 was generally equivalent to the 

current standard level, on average across the U.S. as shown in Figure 2. 

Figure 2: National 98th percentile PM10 concentration design values (y-axis) versus the PM10

expected exceedance concentration-equivalent design values (x-axis) using 2007-2009 data 

 

Comparison of the coefficients of variation for PM10 expected exceedance concentration-equivalent 

design values and 98th percentile PM10 concentration design values 

Figure 3 below shows box-plots of the distributions of monitor-level coefficients of variation (COV) for 

PM10 expected exceedance concentration-equivalent design values (left plot) and 98th percentile PM10

concentration design values (right plot). Monitor-level design values were computed for all complete 3-

year periods from 1988 through 2009. The COV in each of the the two types of design values were 

computed for all monitors that had at least 3 valid pairs of (3-year) design values; there were 952 such 

monitors. As seen in the figure, there is more variation in the expected exceedance concentrationequivalent design values than in the 98th percentile PM10 concentration design values. The mean COV of 

the expected exceedance concentration-equivalent design values is 70 percent higher than the mean COV 

of the 98th percentile PM10 concentration design values. 

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

210

0 50 100 150 200 250 300

• Note that the only valid 2007-2009 data 

pairs (i.e., those composed of three 

complete years) were considered for this 

evaluation. Further, the model was 

constrained to data pairs where the 

expected exceedance equivalent design 

values did not exceed 300 μg/m3.

• N = 596 (out of 613 valid pairs) 

• R-square: 0.70

• Model equation: 3yr_P98 = 19.4 + (0.38 * 

EE_DV)

• PM10 3yr P98 concentration equivalent to 

a 154 μg/m3 EE_DV is ~ 78 μg/m3

•Lower bound of 95% confidence 

interval = 52 μg/m3

•Upper bound of 95% confidence 

interval = 104 μg/m3

Current PM10 NAAQS

regression line

PM10 expected exceedance concentration-equivalent design value

PM10 3-year average 98th percentile 24-hr avg. concentration
4

Figure 3: Distribution of monitor-level coefficients of variation for the PM10 expected exceedance 

concentration-equivalent design values and the 98th percentile PM10 concentration design values 

based on data from 1988 through 2009 

 

PM10 one-expectedexceedance concentrationequivalent design value3-year average 98th 

percentile PM10

concentration design value

coefficients of variation (percent)
5

Numbers of counties with monitors, and population sizes in those counties, not likely to meet the 

current PM10 standard as well as potential alternative standards 

These analyses were conducted as described by Schmidt and Jenkins (2010), except that more recent air 

quality data were used (i.e., from 2007 to 2009) in this iteration. 

Table 1: Estimates of the numbers and percentages of counties with monitors, and populations, 

which are not likely to meet various alternative PM10 NAAQS levels (based on 2007-2009 data) 

Region > All U.S. Northeast Southeast Industrial 

Midwest 

Upper 

Midwest Southwest Northwest Southern 

California 

Outlying 

areas 

Total # of counties with 

monitors > 307 37 57 50 40 25 77 18 3 

Total population (x 1000) > 120,090 15,397 27,181 21,352 5,917 11,112 15,270 22,695 1,167 

Potential 

Alternative 

Standard 

(μg/m3

) 

Statistic Numbers of counties with monitors, populations (x 1000), and percentages of total 

87 

# counties 37 0 2 2 2 11 10 9 1 

population 20,515 0 4,063 507 552 5,924 1,789 7,421 260 

% # counties 12% 0% 4% 4% 5% 44% 13% 50% 33% 

% population 17% 0% 15% 2% 9% 53% 12% 33% 22% 

85 

# counties 39 0 2 3 2 12 10 9 1 

population 21,887 0 4,063 1,789 552 6,014 1,789 7,421 260 

% # counties 13% 0% 4% 6% 5% 48% 13% 50% 33% 

% population 18% 0% 15% 8% 9% 54% 12% 33% 22% 

80 

# counties 45 0 2 4 3 13 11 11 1 

population 24,535 0 4,063 3,183 599 6,131 1,833 8,467 260 

% # counties 15% 0% 4% 8% 8% 52% 14% 61% 33% 

% population 20% 0% 15% 15% 10% 55% 12% 37% 22% 

75 

# counties 55 0 3 6 5 13 15 12 1 

population 35,703 0 4,626 3,491 637 6,131 2,570 17,986 260 

% # counties 18% 0% 5% 12% 13% 52% 19% 67% 33% 

% population 30% 0% 17% 16% 11% 55% 17% 79% 22% 

70 

# counties 71 0 4 7 7 13 27 12 1 

population 43,823 0 4,644 8,868 881 6,131 5,052 17,986 260 

% # counties 23% 0% 7% 14% 18% 52% 35% 67% 33% 

% population 36% 0% 17% 42% 15% 55% 33% 79% 22% 

65 

# counties 87 2 4 9 10 14 33 13 2 

population 49,394 775 4,644 10,421 1,029 7,507 5,989 18,739 290 

% # counties 28% 5% 7% 18% 25% 56% 43% 72% 67% 

% population 41% 5% 17% 49% 17% 68% 39% 83% 25% 

Current 

Standard 

# counties 41 0 3 0 1 11 13 12 1 

population 32,835 0 4,626 0 14 5,485 1,878 20,571 260 

% # counties 13% 0% 5% 0% 3% 44% 17% 67% 33% 

% population 27% 0% 17% 0% 0% 49% 12% 91% 22% 

 

Identification of specific counties with monitors not likely to meet the current PM10 standard as well 

as potential alternative standards 

The tables below present information on the counties with monitors that are not likely to meet the current 

PM10 standard, as well as potential alternative PM10 standards, based on the most recent air quality data 

that is available (i.e., 2007-2009) as well as historic air quality data. The purpose of these tables is to use 

available data to provide some perspective on the potential impacts of revising the current PM10 standard. 

The tables below do not reflect the official list of counties that have been designated as “non-attainment” 

for PM10. That list can be found at the following website: http://www.epa.gov/airquality/greenbk/. 
6

Table 2: Counties with monitors that are not meeting the current PM10 standard (based on 2007-

2009 data) 

 

PM region name State County CBSA name 

Northwest CO Archuleta 

Northwest CO Garfield 

Northwest CO Alamosa 

Northwest WY Albany Laramie, WY 

Northwest WY Sweetwater Rock Springs, WY 

Northwest UT Utah Provo-Orem, UT 

Northwest CA Yolo Sacramento--Arden-Arcade--Roseville, 

CA 

Northwest CO La Plata Durango, CO 

Northwest CA Shasta Redding, CA 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest WA Stevens 

Northwest CA Siskiyou 

Northwest CA Trinity 

Not in PMREG 

Region AK Anchorage Anchorage, AK 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southeast OK Tulsa Tulsa, OK 

Southeast TX Harris Houston-Sugar Land-Baytown, TX 

Southern California CA Orange Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

Southern California CA Los Angeles Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Santa 

Barbara Santa Barbara-Santa Maria-Goleta, CA 

Southern California CA Kern Bakersfield, CA 

Southern California CA Kings Hanford-Corcoran, CA 

Southern California CA San Diego San Diego-Carlsbad-San Marcos, CA 

Southern California CA San 

Bernardino Riverside-San Bernardino-Ontario, CA 

Southern California NV Nye Pahrump, NV 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southern California CA Riverside Riverside-San Bernardino-Ontario, CA 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 

Southwest AZ Pima Tucson, AZ 

Southwest AZ Gila Payson, AZ 

Southwest TX El Paso El Paso, TX 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Yuma Yuma, AZ 

Southwest CA Imperial El Centro, CA 

Southwest NM Luna Deming, NM 

Southwest AZ Santa Cruz Nogales, AZ 

Southwest NM Dona Ana Las Cruces, NM 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Upper Midwest CO Prowers 
7

Table 3: Counties with monitors that are not meeting the current PM10 standard (based on 2006-

2008 data) 

PM region name State County CBSA name 

Industrial Midwest MO St. Louis City St. Louis, MO-IL 

Northeast ME Aroostook 

Northwest UT Utah Provo-Orem, UT 

Northwest CO Garfield 

Northwest ID Power Pocatello, ID 

Northwest WY Sweetwater Rock Springs, WY 

Northwest CA Yolo Sacramento--Arden-Arcade--Roseville, 

CA 

Northwest CA Shasta Redding, CA 

Northwest CA Mendocino Ukiah, CA 

Northwest CO Alamosa 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest CA Siskiyou 

Northwest CA Trinity 

Not in PMREG 

Region AK Anchorage Anchorage, AK 

Not in PMREG 

Region AK Matanuska Susitna Anchorage, AK 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southeast TX Harris Houston-Sugar Land-Baytown, TX 

Southern California CA Orange Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

Southern California CA Los Angeles Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Santa Barbara Santa Barbara-Santa Maria-Goleta, CA 

Southern California CA Kern Bakersfield, CA 

Southern California CA Riverside Riverside-San Bernardino-Ontario, CA 

Southern California CA Kings Hanford-Corcoran, CA 

Southern California NV Nye Pahrump, NV 

Southern California CA San Diego San Diego-Carlsbad-San Marcos, CA 

Southern California CA San Bernardino Riverside-San Bernardino-Ontario, CA 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southwest NM Sandoval Albuquerque, NM 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 

Southwest AZ Pima Tucson, AZ 

Southwest AZ Gila Payson, AZ 

Southwest CA Imperial El Centro, CA 

Southwest AZ Yuma Yuma, AZ 

Southwest TX El Paso El Paso, TX 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest NM Dona Ana Las Cruces, NM 

Southwest AZ Santa Cruz Nogales, AZ 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Southwest NV Clark Las Vegas-Paradise, NV 
8

Table 4: Counties with monitors that are not meeting the current PM10 standard (based on 2005-

2007 data) 

PM region name State County CBSA name 

Industrial Midwest MO St. Louis City St. Louis, MO-IL 

Northeast ME Aroostook 

Northwest WY Campbell Gillette, WY 

Northwest CO Mesa Grand Junction, CO 

Northwest CO Alamosa 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest WY Sweetwater Rock Springs, WY 

Northwest CA Siskiyou 

Not in PMREG 

Region AK Anchorage Anchorage, AK 

Not in PMREG 

Region AK Matanuska Susitna Anchorage, AK 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southeast TX Harris Houston-Sugar Land-Baytown, TX 

Southern California NV Nye Pahrump, NV 

Southern California CA Orange Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

Southern California CA Los Angeles Los Angeles-Long Beach-Santa Ana, 

CA 

Southern California CA Santa Barbara Santa Barbara-Santa Maria-Goleta, 

CA 

Southern California CA Riverside Riverside-San Bernardino-Ontario, 

CA 

Southern California CA San Bernardino Riverside-San Bernardino-Ontario, 

CA 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southwest AZ Pima Tucson, AZ 

Southwest NM Sandoval Albuquerque, NM 

Southwest AZ Gila Payson, AZ 

Southwest NM Dona Ana Las Cruces, NM 

Southwest AZ Yuma Yuma, AZ 

Southwest CA Imperial El Centro, CA 

Southwest TX El Paso El Paso, TX 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Santa Cruz Nogales, AZ 

Upper Midwest MO Jasper Joplin, MO 
9

Table 5: Counties with monitors that are not likely to meet potential alternative PM10 standards 

with 98th percentile forms (based on air quality data from 2007 to 2009) 

98th Percentile 

Standard Level PM region name State County CBSA name 

85 μg/m3 

Industrial Midwest PA Allegheny Pittsburgh, PA 

Industrial Midwest IA Scott Davenport-Moline-Rock 

Island, IA-IL 

Industrial Midwest MO St. Louis City St. Louis, MO-IL 

Upper Midwest NE Douglas Omaha-Council Bluffs, NE-IA 

Upper Midwest SD Pennington Rapid City, SD 

Southwest NM Bernalillo Albuquerque, NM 

Southwest NM Sandoval Albuquerque, NM 

Northwest WY Campbell Gillette, WY 

Northwest WY Converse 

Northwest CO Gunnison 

Northwest NV Washoe Reno-Sparks, NV 

Southern California CA Tulare Visalia-Porterville, CA 

Not in PMREG 

Region AK Anchorage Anchorage, AK 

Southeast TX Harris Houston-Sugar LandBaytown, TX 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southwest NM Dona Ana Las Cruces, NM 

Southwest TX El Paso El Paso, TX 

Southwest AZ Gila Payson, AZ 

Southwest CA Imperial El Centro, CA 

Southwest NM Luna Deming, NM 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Pima Tucson, AZ 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Santa Cruz Nogales, AZ 

Southwest AZ Yuma Yuma, AZ 

Northwest WY Albany Laramie, WY 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest WA Stevens 

Northwest WY Sweetwater Rock Springs, WY 

Northwest CA Trinity 

Northwest UT Utah Provo-Orem, UT 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southern California CA Kern Bakersfield, CA 

Southern California CA Kings Hanford-Corcoran, CA 

Southern California NV Nye Pahrump, NV 

Southern California CA Riverside Riverside-San BernardinoOntario, CA 

Southern California CA San 

Bernardino 

Riverside-San BernardinoOntario, CA 

Southern California CA San Diego San Diego-Carlsbad-San 

Marcos, CA 

80 μg/m3*

Industrial Midwest OH Cuyahoga Cleveland-Elyria-Mentor, OH 

Upper Midwest IA Cerro Gordo Mason City, IA 

Southern California CA Fresno Fresno, CA 

Southern California CA San Luis 

Obispo 

San Luis Obispo-Paso Robles, 

CA 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 

Northwest CO Garfield 
10

75 μg/m3*

Industrial Midwest KY Boyd Huntington-Ashland, WV-KYOH 

Industrial Midwest IL Madison St. Louis, MO-IL 

Upper Midwest NE Cass Omaha-Council Bluffs, NE-IA 

Northwest MT Flathead Kalispell, MT 

Northwest CO Routt 

Northwest CA Stanislaus Modesto, CA 

Northwest UT Weber Ogden-Clearfield, UT 

Southeast OK Tulsa Tulsa, OK 

Upper Midwest CO Prowers 

Southern California CA Los Angeles Los Angeles-Long BeachSanta Ana, CA 

70 μg/m3*

Southeast TN Union Knoxville, TN 

Industrial Midwest IL Cook Chicago-Naperville-Joliet, ILIN-WI 

Upper Midwest MO Buchanan St. Joseph, MO-KS 

Upper Midwest KS Wyandotte Kansas City, MO-KS 

Northwest CO Adams Denver-Aurora, CO 

Northwest CA Butte Chico, CA 

Northwest UT Davis Ogden-Clearfield, UT 

Northwest CA Glenn 

Northwest OR Klamath Klamath Falls, OR 

Northwest WY Lincoln 

Northwest CO Mesa Grand Junction, CO 

Northwest CA Mono 

Northwest CA Sacramento Sacramento--Arden-Arcade--

Roseville, CA 

Northwest MT Silver Bow Butte-Silver Bow, MT 

Northwest CO Alamosa 

Northwest CA Yolo Sacramento--Arden-Arcade--

Roseville, CA 

65 μg/m3*

Not in PMREG 

Region PR Catano San Juan-Caguas-Guaynabo, PR 

Northeast NJ Camden Philadelphia-CamdenWilmington, PA-NJ-DE-MD 

Northeast ME Cumberland Portland-South PortlandBiddeford, ME 

Industrial Midwest OH Franklin Columbus, OH 

Industrial Midwest IN Lake Chicago-Naperville-Joliet, ILIN-WI 

Upper Midwest SD Codington Watertown, SD 

Upper Midwest MO Jasper Joplin, MO 

Upper Midwest KS Neosho 

Southwest NV Clark Las Vegas-Paradise, NV 

Northwest ID Canyon Boise City-Nampa, ID 

Northwest CA Mariposa 

Northwest CA Merced Merced, CA 

Northwest ID Power Pocatello, ID 

Northwest CA San Joaquin Stockton, CA 

Northwest CO San Miguel 

Southern California CA Ventura Oxnard-Thousand OaksVentura, CA 

*Listed counties are those additional counties (i.e., in addition to the counties listed for higher 98th percentile standard levels) 

that are not likely to meet a potential alternative standard with a 98th percentile form. For example, all of the counties listed in 

this table are not likely to meet a 98th percentile standard with a level of 65 μg/m3

. 
11

Table 6: Counties with monitors that are not likely to meet potential alternative PM10 standards 

with 98th percentile forms (based on air quality data from 2006 to 2008) 

Standard Level PM region name State County CBSA name 

85 μg/m3

Industrial Midwest PA Allegheny Pittsburgh, PA 

Industrial Midwest IA Scott Davenport-Moline-Rock Island, IA-IL 

Industrial Midwest MO St. Louis City St. Louis, MO-IL 

Northwest WY Campbell Gillette, WY 

Northwest WY Converse 

Northwest MT Flathead Kalispell, MT 

Northwest CO Gunnison 

Northwest NV Washoe Reno-Sparks, NV 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest WY Sweetwater Rock Springs, WY 

Northwest CA Trinity 

Not in PMREG Region AK Anchorage Anchorage, AK 

Southeast TX Harris Houston-Sugar Land-Baytown, TX 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southern California CA Fresno Fresno, CA 

Southern California CA San Luis Obispo San Luis Obispo-Paso Robles, CA 

Southern California CA Tulare Visalia-Porterville, CA 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southern California CA Kern Bakersfield, CA 

Southern California CA Kings Hanford-Corcoran, CA 

Southern California NV Nye Pahrump, NV 

Southern California CA Riverside Riverside-San Bernardino-Ontario, CA 

Southern California CA San Bernardino Riverside-San Bernardino-Ontario, CA 

Southern California CA San Diego San Diego-Carlsbad-San Marcos, CA 

Southwest NM Bernalillo Albuquerque, NM 

Southwest NM Dona Ana Las Cruces, NM 

Southwest TX El Paso El Paso, TX 

Southwest AZ Gila Payson, AZ 

Southwest CA Imperial El Centro, CA 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Pima Tucson, AZ 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Southwest NM Sandoval Albuquerque, NM 

Southwest AZ Santa Cruz Nogales, AZ 

Southwest AZ Yuma Yuma, AZ 

Upper Midwest NE Cass Omaha-Council Bluffs, NE-IA 

Upper Midwest IA Cerro Gordo Mason City, IA 

Upper Midwest NE Douglas Omaha-Council Bluffs, NE-IA 

Upper Midwest SD Pennington Rapid City, SD 

Upper Midwest KS Wyandotte Kansas City, MO-KS 

80 μg/m3*

Industrial Midwest KY Boyd Huntington-Ashland, WV-KY-OH 

Northwest CO Alamosa 

Northwest CO Garfield 

Southeast TN Union Knoxville, TN 

Southern California CA Orange Los Angeles-Long Beach, CA 

Upper Midwest MO Jasper Joplin, MO 
12

75 μg/m3*

Northeast ME Aroostook 

Northwest CO Adams Denver-Aurora, CO 

Northwest MT Big Horn 

Northwest CA Butte Chico, CA 

Northwest CO Routt 

Northwest CA San Joaquin Stockton, CA 

Northwest CA Stanislaus Modesto, CA 

Northwest ID Power Pocatello, ID 

Northwest UT Utah Provo-Orem, UT 

Northwest CA Yolo Sacramento--Arden-Arcade--Roseville, CA 

Southeast OK Kay Ponca City, OK 

Southeast SC Lexington Columbia, SC 

Southern California CA Los Angeles Los Angeles-Long Beach-Santa Ana, CA 

Southwest NV Clark Las Vegas-Paradise, NV 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 

70 μg/m3*

Industrial Midwest IL Cook Chicago-Naperville-Joliet, IL-IN-WI 

Industrial Midwest OH Cuyahoga Cleveland-Elyria-Mentor, OH 

Industrial Midwest IN Lake Chicago-Naperville-Joliet, IL-IN-WI 

Northwest CA Merced Merced, CA 

Northwest CO Mesa Grand Junction, CO 

Northwest CA Mono 

Northwest MT Silver Bow Butte-Silver Bow, MT 

Not in PMREG Region PR Catano San Juan-Caguas-Guaynabo, PR 

Not in PMREG Region PR Guaynabo San Juan-Caguas-Guaynabo, PR 

Not in PMREG Region AK Matanuska Susitna Anchorage, AK 

Southeast LA West Baton Rouge Baton Rouge, LA 

Southwest AZ Apache 

Upper Midwest MO Buchanan St. Joseph, MO-KS 

Upper Midwest CO Prowers 

65 μg/m3*

Industrial Midwest WV Brooke Weirton-Steubenville, WV-OH 

Industrial Midwest OH Franklin Columbus, OH 

Industrial Midwest PA Lawrence New Castle, PA 

Industrial Midwest IL Madison St. Louis, MO-IL 

Industrial Midwest IN Perry 

Industrial Midwest MI Wayne Detroit-Warren-Livonia, MI 

Northeast ME Cumberland Portland-South Portland-Biddeford, ME 

Northeast VA Frederick Winchester, VA-WV 

Northeast PA Northampton Allentown-Bethlehem-Easton, PA-NJ 

Northwest ID Canyon Boise City-Nampa, ID 

Northwest UT Davis Ogden-Clearfield, UT 

Northwest OR Klamath Klamath Falls, OR 

Northwest CA Mariposa 

Northwest MT Missoula Missoula, MT 

Northwest WY Sheridan Sheridan, WY 

Northwest WA Spokane Spokane, WA 

Northwest CA Tehama Red Bluff, CA 

Northwest WA Walla Walla Walla Walla, WA 

Northwest UT Weber Ogden-Clearfield, UT 

Northwest CA Shasta Redding, CA 

Southeast TX Nueces Corpus Christi, TX 

Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

Southwest TX Hidalgo McAllen-Edinburg-Mission, TX 

Southwest TX Webb Laredo, TX 

Upper Midwest KS Neosho 

*Listed counties are those additional counties (i.e., in addition to the counties listed for higher 98th percentile standard levels) 

that are not likely to meet a potential alternative standard with a 98th percentile form. For example, all of the counties listed in 

this table are not likely to meet a 98th percentile standard with a level of 65 μg/m3

. 
13

Table 7: Counties with monitors that are not likely to meet potential alternative PM10 standards 

with 98th percentile forms (based on air quality data from 2005 to 2007) 

Standard Level PM region name State County CBSA name 

85 μg/m3

Industrial Midwest PA Allegheny Pittsburgh, PA 

Industrial Midwest IA Scott Davenport-Moline-Rock Island, IA-IL 

Industrial Midwest MO St. Louis City St. Louis, MO-IL 

Northwest WY Converse 

Northwest NV Washoe Reno-Sparks, NV 

Northwest WY Campbell Gillette, WY 

Northwest UT Salt Lake Salt Lake City, UT 

Northwest WY Sweetwater Rock Springs, WY 

Not in PMREG AK Anchorage Anchorage, AK 

Southeast OK Kay Ponca City, OK 

Southeast SC Lexington Columbia, SC 

Southeast TX Harris Houston-Sugar Land-Baytown, TX 

Southeast AL Jefferson Birmingham-Hoover, AL 

Southern California CA Fresno Fresno, CA 

Southern California CA Kern Bakersfield, CA 

Southern California CA Kings Hanford-Corcoran, CA 

Southern California CA Tulare Visalia-Porterville, CA 

Southern California CA Imperial El Centro, CA 

Southern California CA Inyo Bishop, CA 

Southern California CA Riverside Riverside-San Bernardino-Ontario, CA 

Southern California CA San Bernardino Riverside-San Bernardino-Ontario, CA 

Southwest NM Bernalillo Albuquerque, NM 

Southwest NM Dona Ana Las Cruces, NM 

Southwest TX El Paso El Paso, TX 

Southwest AZ Gila Payson, AZ 

Southwest CA Imperial El Centro, CA 

Southwest AZ Maricopa Phoenix-Mesa-Scottsdale, AZ 

Southwest AZ Pima Tucson, AZ 

Southwest AZ Pinal Phoenix-Mesa-Scottsdale, AZ 

Southwest NM Sandoval Albuquerque, NM 

Southwest AZ Santa Cruz Nogales, AZ 

Southwest AZ Yuma Yuma, AZ 

Upper Midwest NE Cass Omaha-Council Bluffs, NE-IA 

Upper Midwest IA Cerro Gordo Mason City, IA 

Upper Midwest NE Douglas Omaha-Council Bluffs, NE-IA 

Upper Midwest SD Pennington Rapid City, SD 

Upper Midwest MO Jasper Joplin, MO 

80 μg/m3*

Industrial Midwest IN Lake Chicago-Naperville-Joliet, IL-IN-WI 

Northwest CO Adams Denver-Aurora, CO 

Northwest MT Flathead Kalispell, MT 

Northwest CO Gunnison 

Not in PMREG 

region PR Catano San Juan-Caguas-Guaynabo, PR 

Not in PMREG 

region PR Ponce Ponce, PR 

Southeast TN Union Knoxville, TN 

75 μg/m3*

Industrial Midwest KY Boyd Huntington-Ashland, WV-KY-OH 

Industrial Midwest IL Cook Chicago-Naperville-Joliet, IL-IN-WI 

Industrial Midwest OH Cuyahoga Cleveland-Elyria-Mentor, OH 

Industrial Midwest MI Wayne Detroit-Warren-Livonia, MI 

Northeast PA Northampton Allentown-Bethlehem-Easton, PA-NJ 

Northwest CA Santa Clara San Jose-Sunnyvale-Santa Clara, CA 
14

Northwest WY Sheridan Sheridan, WY 

Northwest CA Stanislaus Modesto, CA 

Northwest CO Alamosa 

Not in PMREG 

region AK Matanuska Susitna Anchorage, AK 

Southeast SC Georgetown Georgetown, SC 

Southeast FL Manatee Sarasota-Bradenton-Venice, FL 

Southern California NV Nye Pahrump, NV 

Southwest NV Clark Las Vegas-Paradise, NV 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 

Upper Midwest KS Wyandotte Kansas City, MO-KS 

70 μg/m3*

Industrial Midwest WV Brooke Weirton-Steubenville, WV-OH 

Industrial Midwest OH Franklin Columbus, OH 

Northwest UT Davis Ogden-Clearfield, UT 

Northwest CA Merced Merced, CA 

Northwest CO Routt 

Northwest MT Silver Bow Butte-Silver Bow, MT 

Northwest WA Spokane Spokane, WA 

Northwest UT Utah Provo-Orem, UT 

Northwest CO Mesa Grand Junction, CO 

Not in PMREG 

region PR Guaynabo San Juan-Caguas-Guaynabo, PR 

Southeast TX Cameron Brownsville-Harlingen, TX 

Southeast TN McMinn Athens, TN 

Southeast LA West Baton Rouge Baton Rouge, LA 

Southern California CA Los Angeles Los Angeles-Long Beach, CA 

Southern California CA Orange Los Angeles-Long Beach, CA 

Southwest TX Webb Laredo, TX 

65 μg/m3*

Industrial Midwest PA Beaver Pittsburgh, PA 

Industrial Midwest OH Columbiana East Liverpool-Salem, OH 

Industrial Midwest WV Hancock Weirton-Steubenville, WV-OH 

Industrial Midwest PA Lawrence New Castle, PA 

Industrial Midwest IL Madison St. Louis, MO-IL 

Industrial Midwest IN Perry 

Industrial Midwest IL Saint Clair St. Louis, MO-IL 

Industrial Midwest OH Scioto Portsmouth, OH 

Northeast ME Aroostook 

Northwest OR Klamath Klamath Falls, OR 

Northwest MT Lincoln 

Northwest CA Mono 

Northwest ID Power Pocatello, ID 

Northwest CA San Joaquin Stockton, CA 

Northwest CO Summit Silverthorne, CO 

Northwest WA Walla Walla Walla Walla, WA 

Northwest UT Weber Ogden-Clearfield, UT 

Not in PMREG 

region PR San Juan San Juan-Caguas-Guaynabo, PR 

Southeast FL Hillsborough Tampa-St. Petersburg-Clearwater, FL 

Southeast OK Muskogee Muskogee, OK 

Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

Southwest TX Hidalgo McAllen-Edinburg-Mission, TX 

Upper Midwest MN Ramsey Minneapolis-St. Paul, MN-WI 

*Listed counties are those additional counties (i.e., in addition to the counties listed for higher 98th percentile standard levels) 

that are not likely to meet a potential alternative standard with a 98th percentile form. For example, all of the counties listed in 

this table are not likely to meet a 98th percentile standard with a level of 65 μg/m3

. 
15

Table 8: Counties with monitors that meet the current standard but are not likely to meet a 

potential alternative standard with a 98th percentile form (based on air quality from 2007 to 2009)# 

Potential 

Alternative 

Standard 

PM region name State County CBSA name 

85 μg/m3

Industrial Midwest 

IA Scott Davenport-Moline-Rock Island, IA-IL 

MO St. Louis City St. Louis, MO-IL 

PA Allegheny Pittsburgh, PA 

Northwest 

CO Gunnison 

NV Washoe Reno-Sparks, NV 

WY Campbell Gillette, WY 

WY Converse 

Southern California CA Tulare Visalia-Porterville, CA 

Southwest NM Bernalillo Albuquerque, NM 

NM Sandoval Albuquerque, NM 

Upper Midwest NE Douglas Omaha-Council Bluffs, NE-IA 

SD Pennington Rapid City, SD 

80 μg/m3*

Industrial Midwest OH Cuyahoga Cleveland-Elyria-Mentor, OH 

Southern California CA Fresno Fresno, CA 

CA San Luis Obispo San Luis Obispo-Paso Robles, CA 

Upper Midwest IA Cerro Gordo Mason City, IA 

75 μg/m3*

Industrial Midwest IL Madison St. Louis, MO-IL 

KY Boyd Huntington-Ashland, WV-KY-OH 

Northwest 

CA Stanislaus Modesto, CA 

CO Routt 

MT Flathead Kalispell, MT 

UT Weber Ogden-Clearfield, UT 

Upper Midwest NE Cass Omaha-Council Bluffs, NE-IA 

70 μg/m3*

Industrial Midwest IL Cook Chicago-Naperville-Joliet, IL-IN-WI 

Northwest 

CA Butte Chico, CA 

CA Glenn 

CA Mono 

CA Sacramento Sacramento--Arden-Arcade--Roseville, 

CA 

CO Adams Denver-Aurora, CO 

CO Mesa Grand Junction, CO 

MT Silver Bow Butte-Silver Bow, MT 

OR Klamath Klamath Falls, OR 

UT Davis Ogden-Clearfield, UT 

WY Lincoln 

Southeast TN Union Knoxville, TN 

Upper Midwest KS Wyandotte Kansas City, MO-KS 

MO Buchanan St. Joseph, MO-KS 
16

65 μg/m3*

Industrial Midwest IN Lake Chicago-Naperville-Joliet, IL-IN-WI 

OH Franklin Columbus, OH 

Northeast 

ME Cumberland Portland-South Portland-Biddeford, 

ME 

NJ Camden Philadelphia-Camden-Wilmington, 

PA-NJ-DE-MD 

Northwest 

CA Mariposa 

CA Merced Merced, CA 

CA San Joaquin Stockton, CA 

CO San Miguel 

ID Canyon Boise City-Nampa, ID 

ID Power Pocatello, ID 

Southwest NV Clark Las Vegas-Paradise, NV 

Upper Midwest 

KS Neosho 

MO Jasper Joplin, MO 

SD Codington Watertown, SD 

Not in PMREG Region PR Catano San Juan-Caguas-Guaynabo, PR #

PM10 air quality in these counties is characterized in more detail in the appendix to this memo (see below). 

*Listed counties are those additional counties (i.e., in addition to the counties listed for higher 98th percentile standard levels) 

that meet the current standard but are not likely to meet a potential alternative standard with a 98th percentile form. For 

example, all of the counties listed in this table are not likely to meet a 98th percentile standard with a level of 65 μg/m3. 

Table 9: Counties with monitors that do not meet the current standard but are likely to meet a 

potential alternative standard with a 98th percentile form (based on air quality from 2007 to 2009)#

#

PM10 air quality in these counties is characterized in more detail in the appendix to this memo (see below). 

*Listed counties are those additional counties (i.e., in addition to the counties listed for lower 98th percentile standard levels) 

that are not likely to meet the current standard but meet a potential alternative standard with a 98th percentile form. For 

example, all counties listed in this table are likely to meet a 98th percentile standard with a level of 85 μg/m3

. 

References 

Schmidt, M., Jenkins S.M. (2010). Analyses of PM10 and PM10-2.5 Data for the PM NAAQS Review. 

Memorandum to PM NAAQS review docket EPA-HQ-OAR-2007-0492.

98th Percentile 

Standard Level PM region name State County CBSA name 

65 μg/m3

Northwest 

CA Shasta Redding, CA 

CA Siskiyou 

CO Archuleta 

CO La Plata Durango, CO 

Southern California CA Orange Los Angeles-Long Beach-Santa Ana, CA 

CA Santa Barbara Santa Barbara-Santa Maria-Goleta, CA 

70 μg/m3* Southern California CA Ventura Oxnard-Thousand Oaks-Ventura, CA 

75 μg/m3* Northwest CA Yolo Sacramento--Arden-Arcade--Roseville, CA 

CO Alamosa 

80 μg/m3*

Southeast OK Tulsa Tulsa, OK 

Southern California CA Los Angeles Los Angeles-Long Beach-Santa Ana, CA 

Upper Midwest CO Prowers 

85 μg/m3* Northwest CO Garfield 

Southwest AZ Cochise Sierra Vista-Douglas, AZ 
17

Appendix: PM10 Air Quality Distributions 

 
18

Table A-1: Average 24-Hour PM10 concentrations in counties with monitors that meet the current 

PM10 standard but are not likely to meet a potential alternative standard with a 98th percentile form 

and a level of 75 μg/m3 (2007-2009) 

County 3-year average PM10

concentration (μg/m3

)*

3-year average of the annual 98th percentile 

PM10 concentration (μg/m3

)*

Fresno 37.3 80.7 

San Luis Obispo 24.5 78.7 

Stanislaus 28.2 75.7 

Tulare 43.2 88.7 

Gunnison 28.4 90.0 

Routt 24.7 77.7 

Madison 33.0 76.0 

Cerro Gordo 32.0 82.3 

Scott 40.7 93.7 

Boyd 31.2 76.7 

St. Louis 36.9 97.3 

Cass 27.5 79.7 

Douglas 36.5 92.3 

Washoe 40.0 96.7 

Bernalillo 36.5 104.3 

Sandoval 42.7 86.0 

Cuyahoga 34.8 80.7 

Allegheny 31.0 85.7 

Pennington 33.5 95.3 

Weber 26.5 75.7 

Campbell 33.0 90.7 

Converse 34.4 93.0 

Flathead 28.8 78.0 

Average 33.3 85.9 

*Distributions of PM10 concentrations for the counties included in Tables A-1 and A-2 are presented below. For the 3-year 

average of 98th percentile PM10 concentrations, we averaged together 98th percentile concentrations for 2007, 2008, and 2009 

(labeled “EPA_P98” in the tables below). 

Table A-2: Average PM10 concentrations in counties with monitors that do not meet the current 

PM10 standard but are likely to meet a potential alternative standard with a 98th percentile form 

and a level of 75 μg/m3

 (2007-2009) 

County 3-year average PM10

concentration (μg/m3

)*

3-year average of the annual 98th

percentile PM10 concentration (μg/m3

)*

Orange 32.8 61.0 

Santa Barbara 20.6 54.0 

Shasta 17.0 59.0 

Siskiyou 16.8 63.3 

Ventura 26.1 69.3 

Yolo 25.7 74.3 

Alamosa 26.9 71.3 

Archuleta 23.7 57.3 

La Plata 20.7 48.3 

Average 23.4 62.0 

*Distributions of PM10 concentrations for the counties included in Tables A-1 and A-2 are presented below. For the 3-year 

average of 98th percentile PM10 concentrations, we averaged together 98th percentile concentrations for 2007, 2008, and 2009 

(labeled “EPA_P98” in the tables below).
19

PM10 air quality distributions at monitors in counties that meet the current standard but are not

likely to meet a potential alternative standard with a 98th percentile form and a level of 75 μg/m3

 

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060190007 POC=1

060190007 1 EPA_P98 84 87 71

060190007 1 max 92 98 84 98

060190007 1 Pct99 92 98 84 92

060190007 1 Pct98 84 87 71 84

060190007 1 Pct97 84 87 71 80

060190007 1 Pct96 78 80 69 77

060190007 1 Pct95 78 77 69 72

060190007 1 Pct90 70 69 63 67

060190007 1 Pct85 57 61 51 56

060190007 1 Pct80 48 55 50 52

060190007 1 Pct75 47 53 45 48

060190007 1 n > 154 0 0 0 0

060190007 1 n 76 - 154 4 4 1 9

060190007 1 n < 76 55 57 61 173

060190007 1 n 59 61 62 182

060190007 1 median 35 35 30 33

060190007 1 mean 37.66 39.64 34.55 37.26

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
20

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060792004 POC=1

060792004 1 EPA_P98 83 75 78

060792004 1 max 130 88 101 130

060792004 1 Pct99 130 88 101 101

060792004 1 Pct98 83 75 78 83

060792004 1 Pct97 83 75 78 75

060792004 1 Pct96 69 63 73 73

060792004 1 Pct95 69 63 73 63

060792004 1 Pct90 57 50 56 54

060792004 1 Pct85 38 41 51 43

060792004 1 Pct80 29 35 45 35

060792004 1 Pct75 26 33 29 29

060792004 1 n > 154 0 0 0 0

060792004 1 n 76 - 154 2 1 2 5

060792004 1 n < 76 57 55 57 169

060792004 1 n 59 56 59 174

060792004 1 median 19 17 17 17

060792004 1 mean 24.59 24.09 24.86 24.52

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

 

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060990005 POC=3

060990005 3 EPA_P98 75 88 64

060990005 3 max 83 111 65 111

060990005 3 Pct99 83 111 65 88

060990005 3 Pct98 75 88 64 75

060990005 3 Pct97 75 88 64 73

060990005 3 Pct96 73 73 60 70

060990005 3 Pct95 73 73 59 69

060990005 3 Pct90 50 69 51 53

060990005 3 Pct85 43 49 39.5 45

060990005 3 Pct80 39 48 36.5 40

060990005 3 Pct75 34 42 30 37.5

060990005 3 n > 154 0 0 0 0

060990005 3 n 76 - 154 1 2 0 3

060990005 3 n < 76 58 55 60 173

060990005 3 n 59 57 60 176

060990005 3 median 21 25 20 21

060990005 3 mean 26.81 32.28 25.57 28.16

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
21

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=061072002 POC=2

061072002 2 EPA_P98 88 91 87

061072002 2 max 98 103 92 103

061072002 2 Pct99 98 103 92 98

061072002 2 Pct98 88 91 87 91

061072002 2 Pct97 88 91 87 87

061072002 2 Pct96 85 85 78 85

061072002 2 Pct95 82.5 82.5 75 80

061072002 2 Pct90 65.5 72 66 68

061072002 2 Pct85 58 66.5 61 61

061072002 2 Pct80 54.5 63.5 53 58

061072002 2 Pct75 51 59 52 54

061072002 2 n > 154 0 0 0 0

061072002 2 n 76 - 154 5 5 3 13

061072002 2 n < 76 55 55 58 168

061072002 2 n 60 60 61 181

061072002 2 median 40 43 38 41

061072002 2 mean 42.12 46.35 41.23 43.22

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=080510004 POC=2

080510004 2 EPA_P98 90 97 83

080510004 2 max 109 108 99 109

080510004 2 Pct99 94 99 83 99

080510004 2 Pct98 90 97 83 91

080510004 2 Pct97 66 91 76 83

080510004 2 Pct96 65 91 67 67

080510004 2 Pct95 60 76 57 65

080510004 2 Pct90 49 58 42 51

080510004 2 Pct85 46 48 38 44

080510004 2 Pct80 39 43 33 38

080510004 2 Pct75 36.5 36 30 34

080510004 2 n > 154 0 0 0 0

080510004 2 n 76 - 154 3 7 4 14

080510004 2 n < 76 113 115 114 342

080510004 2 n 116 122 118 356

080510004 2 median 26 25 21 24

080510004 2 mean 29.59 30.34 25.1 28.36

3 yrs

200

Statistic 2007 2008 9

P

O

Site C

Meets EE-154, 

violates P98-75
22

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=081070003 POC=2

081070003 2 EPA_P98 79 80 74

081070003 2 max 99 124 83 124

081070003 2 Pct99 84 98 78 83

081070003 2 Pct98 79 80 73.5 77

081070003 2 Pct97 65 75 63 69

081070003 2 Pct96 57 70 60.5 62

081070003 2 Pct95 54 67 57 57

081070003 2 Pct90 39 49 49.5 47

081070003 2 Pct85 32 40 42 37

081070003 2 Pct80 30 36 32 32

081070003 2 Pct75 28 32 27 29

081070003 2 n > 154 0 0 0 0

081070003 2 n 76 - 154 8 8 5 21

081070003 2 n < 76 349 290 345 984

081070003 2 n 357 298 350 1005

081070003 2 median 21 23 18 20

081070003 2 mean 23.93 26.91 23.51 24.67

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=171191007 POC=4

171191007 4 EPA_P98 95 79 54

171191007 4 max 128 100 68 128

171191007 4 Pct99 107 86 59 95

171191007 4 Pct98 95 79 54 85

171191007 4 Pct97 90 73 49 75

171191007 4 Pct96 87 72 48 72

171191007 4 Pct95 78 67 44 68

171191007 4 Pct90 67 57 38 56

171191007 4 Pct85 58 50 35 51

171191007 4 Pct80 53 47 33 48

171191007 4 Pct75 50.5 45 30 43

171191007 4 n > 154 0 0 0 0

171191007 4 n 76 - 154 19 8 0 27

171191007 4 n < 76 305 328 243 876

171191007 4 n 324 336 243 903

171191007 4 median 36 30 22 28

171191007 4 mean 39.27 33.26 24.23 32.99

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
23

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=190330018 POC=1

190330018 1 EPA_P98 95 84 68

190330018 1 max 162 104 97 162

190330018 1 Pct99 103 99 74 97

190330018 1 Pct98 95 84 68 84

190330018 1 Pct97 87 77 67 74

190330018 1 Pct96 77 74 63 71

190330018 1 Pct95 72 71 61 69

190330018 1 Pct90 61 59 50 56

190330018 1 Pct85 53 50 44 49

190330018 1 Pct80 47 46 38.5 45

190330018 1 Pct75 44 42 35 40.5

190330018 1 n > 154 1 0 0 1

190330018 1 n 76 - 154 15 12 2 29

190330018 1 n < 76 349 354 363 1066

190330018 1 n 365 366 365 1096

190330018 1 median 32 28 25 28

190330018 1 mean 35.92 32.52 27.43 31.96

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=191630017 POC=2

191630017 2 EPA_P98 100 85 96

191630017 2 max 113 116 119 119

191630017 2 Pct99 104 98 105 103

191630017 2 Pct98 100 85 96 96

191630017 2 Pct97 95 81 94 91

191630017 2 Pct96 93 77 88 86

191630017 2 Pct95 87 76 83 83

191630017 2 Pct90 78 67 65 72

191630017 2 Pct85 71 60 60 63

191630017 2 Pct80 64 55 55.5 58

191630017 2 Pct75 57 52 50 53

191630017 2 n > 154 0 0 0 0

191630017 2 n 76 - 154 46 20 28 94

191630017 2 n < 76 317 344 337 998

191630017 2 n 363 364 365 1092

191630017 2 median 38 36.5 34 36.5

191630017 2 mean 44.02 39.33 38.61 40.65

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
24

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=210190002 POC=1

210190002 1 EPA_P98 94 87 49

210190002 1 max 98 117 100 117

210190002 1 Pct99 98 117 100 100

210190002 1 Pct98 94 87 49 94

210190002 1 Pct97 94 87 49 87

210190002 1 Pct96 92 79 47 77

210190002 1 Pct95 92 76 47 76

210190002 1 Pct90 69 54 43 54

210190002 1 Pct85 61 46 37 47

210190002 1 Pct80 50 39 32 45

210190002 1 Pct75 47 37 29 41

210190002 1 n > 154 0 0 0 0

210190002 1 n 76 - 154 4 4 1 9

210190002 1 n < 76 54 57 56 167

210190002 1 n 58 61 57 176

210190002 1 median 38.5 23 20 25

210190002 1 mean 38.95 30.56 24.02 31.2

3 

Statistic 2007 2008 2009 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=295100093 POC=1

295100093 1 EPA_P98 97 113 82

295100093 1 max 121 191 107 191

295100093 1 Pct99 107 126 88 107

295100093 1 Pct98 97 113 82 96

295100093 1 Pct97 90 97 74 88

295100093 1 Pct96 82 92 72 82

295100093 1 Pct95 81 82 70 75

295100093 1 Pct90 67 67 61 65

295100093 1 Pct85 61 59 51 58

295100093 1 Pct80 55 54 46 52

295100093 1 Pct75 51 48 42.5 48

295100093 1 n > 154 0 2 0 2

295100093 1 n 76 - 154 19 19 10 48

295100093 1 n < 76 335 324 354 1013

295100093 1 n 354 345 364 1063

295100093 1 median 36 33 28 33

295100093 1 mean 39.62 38.49 32.6 36.85

Statistic 2007 2008 2009 3 yrs

PO

Site C

Meets EE-154, 

violates P98-75
25

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=310250009 POC=1

310250009 1 EPA_P98 87 79 73

310250009 1 max 167 102 134 167

310250009 1 Pct99 114 82 78 88

310250009 1 Pct98 87 79 73 78

310250009 1 Pct97 74 72 62 69

310250009 1 Pct96 67 65 55 64

310250009 1 Pct95 66 61 52 61.5

310250009 1 Pct90 53 49 43 49

310250009 1 Pct85 47 42 38 42

310250009 1 Pct80 42 37 34 37

310250009 1 Pct75 37 34 31 34

310250009 1 n > 154 1 0 0 1

310250009 1 n 76 - 154 8 8 6 22

310250009 1 n < 76 330 308 319 957

310250009 1 n 339 316 325 980

310250009 1 median 27 24 22 24

310250009 1 mean 30.27 27.22 24.93 27.52

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=310550045 POC=1

310550045 1 EPA_P98 96 106 75

310550045 1 max 98 143 140 143

310550045 1 Pct99 98 121 85 106

310550045 1 Pct98 96 106 75 98

310550045 1 Pct97 96 104 71 95

310550045 1 Pct96 88 98 67 91

310550045 1 Pct95 88 95 65 87

310550045 1 Pct90 75 86 51 73

310550045 1 Pct85 72 76 44 66

310550045 1 Pct80 67 71 40 58

310550045 1 Pct75 56 66 37 49

310550045 1 n > 154 0 0 0 0

310550045 1 n 76 - 154 5 56 7 68

310550045 1 n < 76 53 299 358 710

310550045 1 n 58 355 365 778

310550045 1 median 38 37 24 29

310550045 1 mean 40.62 44.43 28.18 36.52

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
26

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=320310022 POC=1

320310022 1 EPA_P98 115 87 88

320310022 1 max 130 87 91 130

320310022 1 Pct99 130 87 91 115

320310022 1 Pct98 115 87 88 88

320310022 1 Pct97 115 87 88 87

320310022 1 Pct96 88 86 77 86

320310022 1 Pct95 88 85 77 85

320310022 1 Pct90 76 73 67 71

320310022 1 Pct85 67 65 57 64

320310022 1 Pct80 64 61 50 58

320310022 1 Pct75 58 54 45 50

320310022 1 n > 154 0 0 0 0

320310022 1 n 76 - 154 6 6 3 15

320310022 1 n < 76 53 55 55 163

320310022 1 n 59 61 58 178

320310022 1 median 40 34 30 34

320310022 1 mean 43.97 41.11 34.9 40.03

Statistic 2007 2008 2009 3 yrs

PO

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=350010026 POC=2

350010026 2 EPA_P98 140 98 75

350010026 2 max 140 99 105 140

350010026 2 Pct99 140 99 105 105

350010026 2 Pct98 118.5 98 75 98

350010026 2 Pct97 97 98 75 98

350010026 2 Pct96 91.5 98 72 91

350010026 2 Pct95 86 98 72 86

350010026 2 Pct90 77 60 64 67

350010026 2 Pct85 67 54 58 58

350010026 2 Pct80 57 53 52 52

350010026 2 Pct75 50 47 37 48

350010026 2 n > 154 0 0 0 0

350010026 2 n 76 - 154 5 4 1 10

350010026 2 n < 76 45 50 52 147

350010026 2 n 50 54 53 157

350010026 2 median 39.5 26 30 31

350010026 2 mean 43.06 33.37 33.45 36.48

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
27

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=350439004 POC=1

350439004 1 EPA_P98 83 105 70

350439004 1 max 251 145 82 251

350439004 1 Pct99 98 135 72 102

350439004 1 Pct98 83 105 70 92

350439004 1 Pct97 73 100 68 89

350439004 1 Pct96 71 98 67 81

350439004 1 Pct95 69 94 66 78

350439004 1 Pct90 62 84 62 69

350439004 1 Pct85 56 78 58 64

350439004 1 Pct80 53 72 53 60

350439004 1 Pct75 50 69 51 55

350439004 1 n > 154 1 0 0 1

350439004 1 n 76 - 154 7 43 1 51

350439004 1 n < 76 339 223 314 876

350439004 1 n 347 266 315 928

350439004 1 median 35 52 41 41

350439004 1 mean 38.22 51.09 40.46 42.67

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=390350065 POC=1

390350065 1 EPA_P98 73 95 74

390350065 1 max 91 110 118 118

390350065 1 Pct99 91 110 118 110

390350065 1 Pct98 73 95 74 91

390350065 1 Pct97 73 95 74 83

390350065 1 Pct96 67 85 73 80

390350065 1 Pct95 67 85 73 73

390350065 1 Pct90 61 71 59 61

390350065 1 Pct85 51 62 51 56

390350065 1 Pct80 46 57 48 48

390350065 1 Pct75 43 44 45.5 45

390350065 1 n > 154 0 0 0 0

390350065 1 n 76 - 154 1 5 1 7

390350065 1 n < 76 57 52 55 164

390350065 1 n 58 57 56 171

390350065 1 median 29.5 28 29.5 29

390350065 1 mean 34.1 35.96 34.21 34.76

Statistic 2007 2008 2009 3 yrs

PO

Site C

Meets EE-154, 

violates P98-75
28

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=420037004 POC=5

420037004 5 EPA_P98 107 82 68

420037004 5 max 125 129 90 129

420037004 5 Pct99 109 102 81 102

420037004 5 Pct98 107 82 68 90

420037004 5 Pct97 99 80 62 83

420037004 5 Pct96 91 75 59 78

420037004 5 Pct95 89 73 55 74

420037004 5 Pct90 73 66 47 62

420037004 5 Pct85 62 53 42 52

420037004 5 Pct80 54 46 38 45

420037004 5 Pct75 47 41 34 40

420037004 5 n > 154 0 0 0 0

420037004 5 n 76 - 154 32 13 4 49

420037004 5 n < 76 326 346 354 1026

420037004 5 n 358 359 358 1075

420037004 5 median 28 26 22 25

420037004 5 mean 35.51 31.99 25.49 31

3 

Statistic 2007 2008 2009 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=461030020 POC=3

461030020 3 EPA_P98 88 97 101

461030020 3 max 109 131 138 138

461030020 3 Pct99 101 108 110 106

461030020 3 Pct98 88 97 101 98

461030020 3 Pct97 87 97 94 90

461030020 3 Pct96 77 90 82 85

461030020 3 Pct95 76 88 73 77

461030020 3 Pct90 64 66 59 63

461030020 3 Pct85 57 54 49 54

461030020 3 Pct80 53 47 46 47

461030020 3 Pct75 47 43 40 43

461030020 3 n > 154 0 0 0 0

19 24 16 59

n 76 -

461030020 3 154

461030020 3 n < 76 341 339 347 1027

461030020 3 n 360 363 363 1086

461030020 3 median 29 28 26 28

461030020 3 mean 35.03 34.09 31.42 33.5

3 

Statistic 2007 2008 2009 yrs

P

O

Site C

Meets EE-154, 

violates P98-75
29

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=490570002 POC=1

490570002 1 EPA_P98 84 65 78

490570002 1 max 134 129 181 181

490570002 1 Pct99 98 92 100 94

490570002 1 Pct98 84 65 78 74

490570002 1 Pct97 68 62 66 65

490570002 1 Pct96 64 57 56 60

490570002 1 Pct95 60 55 53 55

490570002 1 Pct90 50 40 44 46

490570002 1 Pct85 44 38 38 39

490570002 1 Pct80 39 35 34 35

490570002 1 Pct75 34 32 31 32

490570002 1 n > 154 0 0 1 1

490570002 1 n 76 - 154 7 5 7 19

490570002 1 n < 76 341 347 351 1039

490570002 1 n 348 352 359 1059

490570002 1 median 24 23 22 23

490570002 1 mean 28.08 25.66 25.7 26.47

Statistic 2007 2008 2009 3 yrs

PO

Site C

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=560050869 POC=2

560050869 2 EPA_P98 100 91 81

560050869 2 max 132 138 131 138

560050869 2 Pct99 114 115 103 107

560050869 2 Pct98 100 91 81 94

560050869 2 Pct97 93 84 75 83

560050869 2 Pct96 83 82 68 80

560050869 2 Pct95 80 78 67 75

560050869 2 Pct90 64 63 56 61

560050869 2 Pct85 56 53 50 53

560050869 2 Pct80 50 50 45 47

560050869 2 Pct75 45 43.5 40 43

560050869 2 n > 154 0 0 0 0

560050869 2 n 76 - 154 24 18 10 52

560050869 2 n < 76 318 330 341 989

560050869 2 n 342 348 351 1041

560050869 2 median 29 30 25 28

560050869 2 mean 35.05 33.9 30.08 32.99

Statistic 2007 2008 2009 3 yrs

PO

Site C

Meets EE-154, 

violates P98-75
30

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=560090851 POC=1

560090851 1 EPA_P98 94 80 105

560090851 1 max 109 112 154 154

560090851 1 Pct99 105 87 106 106

560090851 1 Pct98 94 80 105 94

560090851 1 Pct97 88 72 88 85

560090851 1 Pct96 85 70 75 77

560090851 1 Pct95 78 67 72 72

560090851 1 Pct90 67 57 68 64

560090851 1 Pct85 63 47.5 47 54

560090851 1 Pct80 56 44 43 46

560090851 1 Pct75 50.5 42 41 43

560090851 1 n > 154 0 0 0 0

560090851 1 n 76 - 154 7 3 4 14

560090851 1 n < 76 97 117 114 328

560090851 1 n 104 120 118 342

560090851 1 median 32.5 30 29.5 30

560090851 1 mean 37.62 32.75 33.35 34.44

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Meets EE-154, 

violates P98-75

Meets EE-154, 

violates P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=300290009

Site Statistic 2007 2008 2009 3 yrs

300290009 mean 30.3894 27.8593 22.0500 28.7597

300290009 median 25 22 19.5 23

300290009 n 357 199 60 616

300290009 n < 76 342 193 60 595

300290009 n 76 - 154 15 6 0 21

300290009 n > 154 0 0 0 0

300290009 Pct75 38 35 25.5 36

300290009 Pct80 42 39 29 40

300290009 Pct85 49 41 33 44

300290009 Pct90 55 48 36.5 52

300290009 Pct95 71 59 42.5 66

300290009 Pct96 76 61 44 71

300290009 Pct97 80 76 52 76

300290009 Pct98 87 95 52 87

300290009 Pct99 104 97 69 97

300290009 max 132 106 69 132

300290009 EPA_P98 87 95 52 78
31

PM10 air quality distributions at monitors in counties that do not meet the current standard but are 

likely to meet a potential alternative standard with a 98th percentile form and a level of 75 μg/m3 

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060590007 POC=1

060590007 1 EPA_P98 75 59 49

060590007 1 max 489 61 63 489

060590007 1 Pct99 489 61 63 75

060590007 1 Pct98 75 59 49 63

060590007 1 Pct97 75 59 49 61

060590007 1 Pct96 69 51 48 59

060590007 1 Pct95 69 51 48 53

060590007 1 Pct90 53 45 43 46

060590007 1 Pct85 48 42 40 42

060590007 1 Pct80 39 36 39 39

060590007 1 Pct75 35 35 37 35

060590007 1 n > 154 1 0 0 1

060590007 1 n 76 - 154 0 0 0 0

060590007 1 n < 76 58 58 56 172

060590007 1 n 59 58 56 173

060590007 1 median 29 27 31 28

060590007 1 mean 38.69 28.64 30.79 32.76

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060830008 POC=1

060830008 1 EPA_P98 72 49 41

060830008 1 max 227 55 42 227

060830008 1 Pct99 227 55 42 72

060830008 1 Pct98 72 49 41 49

060830008 1 Pct97 72 49 41 48

060830008 1 Pct96 48 49 34 42

060830008 1 Pct95 44 46 33 40

060830008 1 Pct90 32 33 30 31

060830008 1 Pct85 25.5 27 26 26

060830008 1 Pct80 24.5 25 22 25

060830008 1 Pct75 22.5 25 22 23

060830008 1 n > 154 1 0 0 1

060830008 1 n 76 - 154 0 0 0 0

060830008 1 n < 76 59 61 62 182

060830008 1 n 60 61 62 183

060830008 1 median 18 20 17.5 18

060830008 1 mean 22.48 21.21 18.16 20.6

3 

Statistic 2007 2008 2009 yrs

P

O

Site C

Violates EE-154, 

meets P98-75
32

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060831025 POC=1

060831025 1 EPA_P98 51 48 33

060831025 1 max 320 66 33 320

060831025 1 Pct99 320 66 33 66

060831025 1 Pct98 51 48 33 48

060831025 1 Pct97 51 48 33 33

060831025 1 Pct96 32 35 29 32

060831025 1 Pct95 32 33 28 31

060831025 1 Pct90 27 26.5 26 26.5

060831025 1 Pct85 21 24 20 22

060831025 1 Pct80 19 22 19 20

060831025 1 Pct75 18 20 17 19

060831025 1 n > 154 1 0 0 1

060831025 1 n 76 - 154 0 0 0 0

060831025 1 n < 76 58 60 61 179

060831025 1 n 59 60 61 180

060831025 1 median 15 15 13 15

060831025 1 mean 19.64 16.78 13.36 16.56

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060890004 POC=2

060890004 2 EPA_P98 33 113 31

060890004 2 max 35 236 33 236

060890004 2 Pct99 35 236 33 113

060890004 2 Pct98 33 113 31 74

060890004 2 Pct97 33 113 31 49

060890004 2 Pct96 32 112 30 38

060890004 2 Pct95 32 112 30 35

060890004 2 Pct90 27 49 23 29

060890004 2 Pct85 23 35 23 23

060890004 2 Pct80 22 23 20 21

060890004 2 Pct75 21 20 18 20

060890004 2 n > 154 0 1 0 1

060890004 2 n 76 - 154 0 2 0 2

060890004 2 n < 76 59 55 59 173

060890004 2 n 59 58 59 176

060890004 2 median 14 11 12 13

060890004 2 mean 15.14 22.67 13.37 17.03

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75
33

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=060932001 POC=2

060932001 2 EPA_P98 64 97 29

060932001 2 max 205 176 33 205

060932001 2 Pct99 205 176 33 176

060932001 2 Pct98 64 97 29 87

060932001 2 Pct97 64 97 29 61

060932001 2 Pct96 36 87 19 52

060932001 2 Pct95 36 61 19 38

060932001 2 Pct90 22 38 17.5 26

060932001 2 Pct85 21 28 17 21

060932001 2 Pct80 18 25 16 18

060932001 2 Pct75 17 22 15 17

060932001 2 n > 154 1 1 0 2

060932001 2 n 76 - 154 0 2 0 2

060932001 2 n < 76 57 58 60 175

060932001 2 n 58 61 60 179

060932001 2 median 12.5 13 12 12

060932001 2 mean 16.79 21.57 12.05 16.83

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=061113001 POC=1

061113001 1 EPA_P98 62 61 85

061113001 1 max 245 79 97 245

061113001 1 Pct99 245 79 97 97

061113001 1 Pct98 62 61 85 79

061113001 1 Pct97 62 61 85 61

061113001 1 Pct96 45 52 41 47

061113001 1 Pct95 45 52 41 45

061113001 1 Pct90 40 41 33 39

061113001 1 Pct85 36 36 32 33

061113001 1 Pct80 30 32 31 31

061113001 1 Pct75 29 30 28 30

061113001 1 n > 154 1 0 0 1

061113001 1 n 76 - 154 0 1 2 3

061113001 1 n < 76 57 58 59 174

061113001 1 n 58 59 61 178

061113001 1 median 24 22 24 23

061113001 1 mean 28.6 25.19 24.61 26.1

Statistic 2007 2008 2009 3 yrs

PO

Site C

Violates EE-154, 

meets P98-75
34

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=061131003 POC=1

061131003 1 EPA_P98 60 109 54

061131003 1 max 119 181 64 181

061131003 1 Pct99 119 181 64 119

061131003 1 Pct98 60 109 54 90

061131003 1 Pct97 60 109 54 76

061131003 1 Pct96 54 90 47 64

061131003 1 Pct95 54 88.5 47 63

061131003 1 Pct90 40 63.5 36 42

061131003 1 Pct85 38 45.5 31 38

061131003 1 Pct80 36 40 30 36

061131003 1 Pct75 31 38 27 31

061131003 1 n > 154 0 1 0 1

061131003 1 n 76 - 154 1 4 0 5

061131003 1 n < 76 58 55 59 172

061131003 1 n 59 60 59 178

061131003 1 median 22 25.5 17 20

061131003 1 mean 24.56 32.35 20.2 25.74

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=080030003 POC=1

080030003 1 EPA_P98 71 85 58

080030003 1 max 494 157 157 494

080030003 1 Pct99 84 133 74 89

080030003 1 Pct98 71 85 58 73

080030003 1 Pct97 58 77 54 58

080030003 1 Pct96 56 66 49 55

080030003 1 Pct95 53 55 46 53

080030003 1 Pct90 45 42 40 43

080030003 1 Pct85 41 37 36 38

080030003 1 Pct80 38 35 32 35

080030003 1 Pct75 35 31 30 32

080030003 1 n > 154 1 2 1 4

080030003 1 n 76 - 154 4 7 2 13

080030003 1 n < 76 325 285 311 921

080030003 1 n 330 294 314 938

080030003 1 median 26 23 21 23

080030003 1 mean 28.95 27.19 24.49 26.91

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75
35

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=080070001 POC=3

080070001 3 EPA_P98 47 52 73

080070001 3 max 102 149 255 255

080070001 3 Pct99 53 64 182 73

080070001 3 Pct98 47 52 73 55

080070001 3 Pct97 45 51 67 51

080070001 3 Pct96 42 47 54 47

080070001 3 Pct95 41 44 51 43

080070001 3 Pct90 35 37 37 37

080070001 3 Pct85 33 34 30 33

080070001 3 Pct80 31 32 27 30

080070001 3 Pct75 28 29 26 27

080070001 3 n > 154 0 0 4 4

080070001 3 n 76 - 154 1 1 2 4

080070001 3 n < 76 358 353 348 1059

080070001 3 n 359 354 354 1067

080070001 3 median 21 21 20 21

080070001 3 mean 22.56 23.61 24.93 23.69

Statistic 2007 2008 2009 3 yrs

P

O

Site C

Violates EE-154, 

meets P98-75

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

425

450

475

500

2007 2008 2009 3 years

SITE=080670004 POC=1

080670004 1 EPA_P98 38 57 50

080670004 1 max 40 125 203 203

080670004 1 Pct99 38 59 198 59

080670004 1 Pct98 38 57 50 51

080670004 1 Pct97 33 51 40 40

080670004 1 Pct96 31 51 38 38

080670004 1 Pct95 30 43 36 35

080670004 1 Pct90 27 31 31 29

080670004 1 Pct85 25 28 29 27

080670004 1 Pct80 24 25 26 25

080670004 1 Pct75 23 24 24 24

080670004 1 n > 154 0 0 2 2

080670004 1 n 76 - 154 0 1 0 1

080670004 1 n < 76 115 118 111 344

080670004 1 n 115 119 113 347

080670004 1 median 18 17 19 18

080670004 1 mean 18.61 20.22 23.2 20.66

Statistic 2007 2008 2009 3 yrs

PO

Site C

Violates EE-154, 

meets P98-75