San Joaquin Valley and practicability of attaining the 2006 24-hour PM2.5 NAAQS by the end of 201

EPA Region 9, 2014-12-15

Sheet

24-hr practicability

2014 data

2003-2013 24-hr DVs

p98_ranks
and practicability of attaining the 2006 24-hour PM2.5 NAAQS by the end of 2015

Description

Practicability of attaining 24-hr PM2.5 NAAQS

2014 daily PM.5 data for selected sites from AQS

Valid 24-hour PM2.5 design values for 2003-2013

look-up table for 98th percentile rank given number of samples, Table 1, 40 CFR 50 App. N
Practicability of attaining 2006 24-hour PM2.5 NAAQS by end of 2015

2015 attainment of 2006 NAAQS

Site Name Site ID 2013 98%

Total Est. 

# 

samples 

in 2014

Rank of day 

to use for 

98th 

percentile

Estimated 

2014 98th 

percentile

Max 2015 98th 

percentile allowed 

to attain 2006 24-hr 

NAAQS (35.4) in 

2015

2006 NAAQS 

attainment 

practicable in 

2015?

Fresno-Garland 11 63.8 328 7 65.5 -23.1 No

Bakersfield-California Ave 14 71.8 336 7 72.6 -38.2 No

Bakersfield-Planz 16 96.7 108 3 64.4 -54.9 No

Hanford 1004 67.6 328 7 76.7 -38.1 No

Fresno-Pacific 5025 71.6 120 3 61.8 -27.2 No

Alternative analysis assuming at least 351 valid samples could somehow be collected at each site during all of 2014 (use 8th rank of available data)

Concentrations would have to be less than zero in order for attainment of the 2006 24-hr NAAQS to be possible by the end 

Estimated 2014 98th percentile selected from data in AQS as of Aug. 7, 2014 (see AQS Data Query: 2014-08-07) and assumes 2014 will 

have no higher values than those already in AQS as of Aug. 7, 2014.

Practicability of attainment in 2015 is from comparing max 2015 98th percentile allowed (for attaining the 2006 24-hour NAAQS) to zero. 

A negative max 2015 98th %ile allowed means 2006 NAAQS attainment by the end of 2015 is not possible.

Total Estimated # of samples in 2014 assumes sampling rate seen in 2014 AQS data so far (see AQS Data Query: 2014-08-07) will continue 

throughout 2014. For example, with one quarter's worth of data in AQS, the Fresno-Garland site collected 82 valid samples. EPA assumed 

that 82 samples would also be collected in quarters two through four to come up with a total estimated sample count of 328 for 2014.

2013 98th percentiles from U.S. EPA, 2013 Design Value Reports, PM2.5 Detailed Information Updated 8/24/14, available at 

http://www.epa.gov/airtrends/values.html (“PM25_DesignValues_20112013_FINAL_08_28_14”)
Site Name Site ID 2013 98%

Min # 

samples 

to select 

8th rank

Rank of day 

to use for 

98th 

percentile

Estimated 

2014 98th 

percentile

Max 2015 98th 

percentile allowed 

to attain 2006 24-hr 

NAAQS (35.4) in 

2015

2006 NAAQS 

attainment 

practicable in 

2015?

Fresno-Garland 11 63.8 351 8 63.5 -21.1 No

Bakersfield-California Ave 14 71.8 351 8 70.4 -36.0 No

Bakersfield-Planz 16 96.7 351 8 32.2 -22.7 No

Hanford 1004 67.6 351 8 72.3 -33.7 No

Fresno-Pacific 5025 71.6 351 8 31.7 2.9

Even under the unrealisically liberal assumption that at least 351 valid samples could somehow be collected at each site during 

all of 2014, allowing the use of the 8 th rank as 98th percentile, concentrations for multiple sites would have to be less than 

zero in order for attainment of the 2006 24-hr NAAQS to be possible by the end of 2015.
STATE_

CODE

COUNTY

_CODE SITE_ID

PRIM

ARY_

MONI

TOR_P

OC

MONITOR

_TYPE

SAMPLE_D

ATE VALUE

AQS data for selected SJV sites for PM2

6 19 5025 1 SLAMS 20140102 61.8

6 19 5025 1 SLAMS 20140105 74.5 Site Name Site ID

6 19 5025 1 SLAMS 20140108 51.5 Fresno-Garland 11

6 19 5025 1 SLAMS 20140111 31.6 CA Ave 14

6 19 5025 1 SLAMS 20140114 30.4 Planz 16

6 19 5025 1 SLAMS 20140117 57.7 Hanford 1004

6 19 5025 1 SLAMS 20140120 63.5 Fresno-Pacific 5025

6 19 5025 1 SLAMS 20140123 53.5

6 19 5025 1 SLAMS 20140126 31.9 AQS Data Query: 2014-08-07 (AQS Combined site v

6 19 5025 1 SLAMS 20140129 31.7 (see 2014 SJV PM2.5 Combined site values report 2

6 19 5025 1 SLAMS 20140201 27

6 19 5025 1 SLAMS 20140204 14

6 19 5025 1 SLAMS 20140207 10

6 19 5025 1 SLAMS 20140210 7.1

6 19 5025 1 SLAMS 20140213 25.1

6 19 5025 1 SLAMS 20140216 8.1

6 19 5025 1 SLAMS 20140219 8.3

6 19 5025 1 SLAMS 20140222 22.9

6 19 5025 1 SLAMS 20140225 25.2

6 19 5025 1 SLAMS 20140228 1

6 19 5025 1 SLAMS 20140303 6.7

6 19 5025 1 SLAMS 20140306 12.8

6 19 5025 1 SLAMS 20140309 11.5

6 19 5025 1 SLAMS 20140312 6

6 19 5025 1 SLAMS 20140315 11.3

6 19 5025 1 SLAMS 20140318 3.6

6 19 5025 1 SLAMS 20140321 8.3

6 19 5025 1 SLAMS 20140324 9.3

6 19 5025 1 SLAMS 20140327 3.8

6 19 5025 1 SLAMS 20140330 3.5

6 29 14 1 SLAMS 20140101 84.3

6 29 14 1 SLAMS 20140102 75.4

6 29 14 1 SLAMS 20140103 78.1

6 29 14 1 SLAMS 20140104 73.1

6 29 14 1 SLAMS 20140105 72.6

6 29 14 1 SLAMS 20140106 80.5

6 29 14 1 SLAMS 20140107 70.4

6 29 14 1 SLAMS 20140108 61.1

6 29 14 1 SLAMS 20140109 45.1

6 29 14 1 SLAMS 20140110 26
6 29 14

1 SLAMS 20140111 26

6 29 141 SLAMS 20140112 27.6

6 29 141 SLAMS 20140113 25.3

6 29 141 SLAMS 20140114 36.5

6 29 141 SLAMS 20140115 50.9

6 29 141 SLAMS 20140116 54.6

6 29 141 SLAMS 20140117 58.7

6 29 141 SLAMS 20140118 59.1

6 29 141 SLAMS 20140119 66.4

6 29 141 SLAMS 20140120 63.2

6 29 141 SLAMS 20140121 81.3

6 29 141 SLAMS 20140122 70.1

6 29 141 SLAMS 20140123 30.3

6 29 141 SLAMS 20140124 8.3

6 29 141 SLAMS 20140125 23.3

6 29 141 SLAMS 20140126 28.5

6 29 141 SLAMS 20140127 38.7

6 29 141 SLAMS 20140128 43

6 29 141 SLAMS 20140129 39

6 29 141 SLAMS 20140131 12

6 29 141 SLAMS 20140201 16.3

6 29 141 SLAMS 20140202 11.3

6 29 141 SLAMS 20140203 12.2

6 29 141 SLAMS 20140204 15.5

6 29 141 SLAMS 20140205 24.5

6 29 141 SLAMS 20140206 18.4

6 29 141 SLAMS 20140207 11.6

6 29 141 SLAMS 20140210 8.1

6 29 141 SLAMS 20140213 29.9

6 29 141 SLAMS 20140214 26.3

6 29 141 SLAMS 20140215 39.6

6 29 141 SLAMS 20140216 27.4

6 29 141 SLAMS 20140217 13.9

6 29 141 SLAMS 20140218 12.4

6 29 141 SLAMS 20140219 14.8

6 29 141 SLAMS 201402209

6 29 141 SLAMS 20140221 16

6 29 141 SLAMS 20140222 20.9

6 29 141 SLAMS 20140223 19.5

6 29 141 SLAMS 20140224 23.8

6 29 141 SLAMS 20140225 17.3

6 29 141 SLAMS 20140226 11.9

6 29 141 SLAMS 201402275

6 29 141 SLAMS 20140228 4.9

6 29 141 SLAMS 20140301 2.4

6 29 141 SLAMS 20140302 3.5

6 29 141 SLAMS 20140303 9.7
6 29 14

1 SLAMS 20140304 17.6

6 29 141 SLAMS 20140305 21.9

6 29 141 SLAMS 20140306 21.2

6 29 141 SLAMS 20140307 10.3

6 29 141 SLAMS 20140308 14.1

6 29 141 SLAMS 20140309 11.7

6 29 141 SLAMS 20140310 11.2

6 29 141 SLAMS 20140312 7.7

6 29 141 SLAMS 20140313 7.8

6 29 141 SLAMS 20140314 7.9

6 29 141 SLAMS 20140315 10.5

6 29 141 SLAMS 20140316 13

6 29 141 SLAMS 20140317 7.6

6 29 141 SLAMS 20140318 6.1

6 29 141 SLAMS 20140319 8.4

6 29 141 SLAMS 20140320 11

6 29 141 SLAMS 20140321 11.3

6 29 141 SLAMS 20140322 10

6 29 141 SLAMS 20140323 10.3

6 29 141 SLAMS 20140324 12.5

6 29 141 SLAMS 20140325 13.2

6 29 141 SLAMS 20140326 3.1

6 29 141 SLAMS 20140327 4.7

6 29 141 SLAMS 201403289

6 29 141 SLAMS 20140329 10

6 29 141 SLAMS 20140330 4.1

6 29 141 SLAMS 20140331 5.9

6 29 161 SLAMS 20140102 76.7

6 29 161 SLAMS 20140105 69.5

6 29 161 SLAMS 20140108 58.4

6 29 161 SLAMS 20140111 26.3

6 29 161 SLAMS 20140114 31

6 29 161 SLAMS 20140117 64.4

6 29 161 SLAMS 20140120 60.4

6 29 161 SLAMS 20140123 49.7

6 29 161 SLAMS 20140126 32.2

6 29 161 SLAMS 20140129 40.8

6 29 161 SLAMS 20140201 17.8

6 29 161 SLAMS 20140208 7.8

6 29 161 SLAMS 20140210 12.4

6 29 161 SLAMS 20140211 10.1

6 29 161 SLAMS 20140216 30.9

6 29 161 SLAMS 20140219 17.8

6 29 161 SLAMS 20140222 23.6

6 29 161 SLAMS 20140225 21

6 29 161 SLAMS 20140228 19.8

6 29 161 SLAMS 20140305 27.8
6 29 16

1 SLAMS 20140306 25.4

6 29 161 SLAMS 20140307 10.3

6 29 161 SLAMS 20140313 11.6

6 29 161 SLAMS 20140315 17.1

6 29 161 SLAMS 20140316 14.5

6 29 161 SLAMS 20140318 8.5

6 29 161 SLAMS 20140324 16.5

6 31 10043 SPM 20140101 96.7

6 31 10043 SPM 20140102 81.9

6 31 10043 SPM 20140103 80.7

6 31 10043 SPM 20140104 82.3

6 31 10043 SPM 20140105 70.2

6 31 10043 SPM 20140106 69.4

6 31 10043 SPM 20140107 80.7

6 31 10043 SPM 20140108 54

6 31 10043 SPM 20140109 24.2

6 31 10043 SPM 20140110 29.1

6 31 10043 SPM 20140111 31.9

6 31 10043 SPM 20140112 14.3

6 31 10043 SPM 20140113 19.3

6 31 10043 SPM 20140114 23.5

6 31 10043 SPM 20140115 41.4

6 31 10043 SPM 20140116 50.9

6 31 10043 SPM 20140117 62.2

6 31 10043 SPM 20140118 63.9

6 31 10043 SPM 20140119 77.8

6 31 10043 SPM 20140120 72.3

6 31 10043 SPM 20140121 63.2

6 31 10043 SPM 20140122 76.7

6 31 10043 SPM 20140123 54.6

6 31 10043 SPM 20140124 36.2

6 31 10043 SPM 20140125 34

6 31 10043 SPM 20140126 31.7

6 31 10043 SPM 20140127 34.7

6 31 10043 SPM 20140128 33.5

6 31 10043 SPM 20140129 36.5

6 31 10043 SPM 20140130 22.1

6 31 10043 SPM 20140131 6.2

6 31 10043 SPM 20140201 20.5

6 31 10043 SPM 20140202 13.7

6 31 10043 SPM 20140203 7.4

6 31 10043 SPM 20140204 10.7

6 31 10043 SPM 20140205 15.1

6 31 10043 SPM 20140206 16.3

6 31 10043 SPM 20140207 11.7

6 31 10043 SPM 20140208 11.6

6 31 10043 SPM 20140209 6.5
6 31 1004

3 SPM 201402106

6 31 10043 SPM 20140211 12.2

6 31 10043 SPM 20140212 17.4

6 31 10043 SPM 20140213 24.2

6 31 10043 SPM 20140214 34.5

6 31 10043 SPM 20140215 57.4

6 31 10043 SPM 20140216 7.3

6 31 10043 SPM 20140217 4.6

6 31 10043 SPM 20140218 7.6

6 31 10043 SPM 20140219 6.3

6 31 10043 SPM 20140220 7.5

6 31 10043 SPM 20140221 20

6 31 10043 SPM 20140222 19.7

6 31 10043 SPM 20140223 17.5

6 31 10043 SPM 20140224 21.2

6 31 10043 SPM 20140225 22.2

6 31 10043 SPM 20140226 5.1

6 31 10043 SPM 20140227 2.1

6 31 10043 SPM 20140301 -0.4

6 31 10043 SPM 20140302 3.5

6 31 10043 SPM 20140314 14

6 31 10043 SPM 20140315 16.5

6 31 10043 SPM 20140316 23.7

6 31 10043 SPM 201403178

6 31 10043 SPM 20140318 5.9

6 31 10043 SPM 20140319 10

6 31 10043 SPM 20140320 15.2

6 31 10043 SPM 20140321 12.9

6 31 10043 SPM 20140322 12.4

6 31 10043 SPM 20140323 11.7

6 31 10043 SPM 20140324 12.8

6 31 10043 SPM 20140325 13

6 31 10043 SPM 20140326 7.6

6 31 10043 SPM 20140327 7.7

6 31 10043 SPM 20140328 14.5

6 31 10043 SPM 20140329 16

6 31 10043 SPM 20140330 6.9

6 31 10043 SPM 20140331 6.7

6 31 10043 SPM 20140401 5.1

6 31 10043 SPM 20140402 4.9

6 31 10043 SPM 20140408 22.6

6 31 10043 SPM 20140409 17.5

6 31 10043 SPM 20140410 22.7

6 31 10043 SPM 20140411 14.6

6 31 10043 SPM 20140412 12.4

6 31 10043 SPM 20140413 13

6 31 10043 SPM 20140414 15.3
6 31 1004

3 SPM 20140415 14.4

6 31 10043 SPM 20140416 14.8

6 31 10043 SPM 20140417 10.9

6 31 10043 SPM 20140418 10.4

6 31 10043 SPM 20140419 10.4

6 31 10043 SPM 20140420 8.8

6 31 10043 SPM 20140421 15

6 31 10043 SPM 20140422 7.7

6 31 10043 SPM 20140423 6.3

6 31 10043 SPM 20140424 7.2

6 31 10043 SPM 20140425 6.6

6 31 10043 SPM 20140426 5.7

6 31 10043 SPM 20140427 5.8

6 31 10043 SPM 20140428 11.4

6 31 10043 SPM 20140429 13.7

6 31 10043 SPM 20140430 20

6 31 10043 SPM 20140501 15.3

6 31 10043 SPM 20140502 13.2

6 31 10043 SPM 20140503 8.6

6 31 10043 SPM 20140504 7.2

6 31 10043 SPM 20140505 7.8

6 31 10043 SPM 20140506 8.2

6 31 10043 SPM 20140507 11.2

6 31 10043 SPM 20140508 9.4

6 31 10043 SPM 20140509 3.8

6 31 10043 SPM 20140510 6.2

6 31 10043 SPM 20140511 3.7

6 31 10043 SPM 20140512 7.8

6 31 10043 SPM 20140513 10.6

6 31 10043 SPM 20140514 10.7

6 31 10043 SPM 20140515 14.3

6 31 10043 SPM 20140516 12.5

6 31 10043 SPM 20140517 6.3

6 31 10043 SPM 20140518 3.2

6 31 10043 SPM 20140519 4.8

6 31 10043 SPM 20140520 2.3

6 31 10043 SPM 201405218

6 31 10043 SPM 20140522 10.7

6 31 10043 SPM 20140523 10.7

6 31 10043 SPM 20140524 7.6

6 31 10043 SPM 20140525 8.6

6 31 10043 SPM 201405266

6 31 10043 SPM 20140527 4.3

6 31 10043 SPM 20140528 7.5

6 31 10043 SPM 20140529 5.5

6 31 10043 SPM 201405307

6 31 10043 SPM 20140531 10.4
6 31 1004

3 SPM 20140601 11.6

6 31 10043 SPM 20140602 7.9

6 31 10043 SPM 201406038

6 31 10043 SPM 20140604 9.2

6 31 10043 SPM 20140605 9.5

6 31 10043 SPM 20140606 9.8

6 31 10043 SPM 20140607 14

6 31 10043 SPM 20140608 13.6

6 31 10043 SPM 20140609 14

6 31 10043 SPM 20140610 13.8

6 31 10043 SPM 20140611 19.2

6 31 10043 SPM 20140612 10

6 31 10043 SPM 20140613 3.7

6 31 10043 SPM 20140614 6.7

6 31 10043 SPM 20140615 5.5

6 31 10043 SPM 20140616 8.5

6 31 10043 SPM 20140617 6.2

6 31 10043 SPM 20140618 7.8

6 31 10043 SPM 20140619 6.8

6 31 10043 SPM 20140620 7.6

6 31 10043 SPM 20140621 3.8

6 31 10043 SPM 20140622 5.5

6 31 10043 SPM 20140623 9.2

6 31 10043 SPM 201406247

6 31 10043 SPM 20140625 5.6

6 31 10043 SPM 20140626 3.8

6 31 10043 SPM 20140627 4.6

6 31 10043 SPM 20140628 4.4

6 31 10043 SPM 20140629 5.1

6 31 10043 SPM 20140630 11.4

6 19 111 SLAMS 20140101 94.6

6 19 111 SLAMS 20140102 70.6

6 19 111 SLAMS 20140103 82

6 19 111 SLAMS 20140104 76.4

6 19 111 SLAMS 20140105 71.5

6 19 111 SLAMS 20140106 59.7

6 19 111 SLAMS 20140107 56

6 19 111 SLAMS 20140108 52.7

6 19 111 SLAMS 20140110 49.6

6 19 111 SLAMS 20140111 36.6

6 19 111 SLAMS 20140112 26

6 19 111 SLAMS 20140113 36.1

6 19 111 SLAMS 20140114 36.8

6 19 111 SLAMS 20140115 39.3

6 19 111 SLAMS 20140116 50.9

6 19 111 SLAMS 20140117 60.5

6 19 111 SLAMS 20140118 59.9
6 19 11

1 SLAMS 20140119 63.5

6 19 111 SLAMS 20140120 65.5

6 19 111 SLAMS 20140121 51.8

6 19 111 SLAMS 20140122 66.7

6 19 111 SLAMS 20140123 55.9

6 19 111 SLAMS 20140124 28.8

6 19 111 SLAMS 20140125 26.2

6 19 111 SLAMS 20140126 28.9

6 19 111 SLAMS 20140127 33.2

6 19 111 SLAMS 20140128 31.8

6 19 111 SLAMS 20140129 30.8

6 19 111 SLAMS 20140131 8.7

6 19 111 SLAMS 20140204 14.3

6 19 111 SLAMS 20140205 23.2

6 19 111 SLAMS 20140206 15.8

6 19 111 SLAMS 20140207 9.7

6 19 111 SLAMS 20140208 7.9

6 19 111 SLAMS 201402096

6 19 111 SLAMS 20140210 6.3

6 19 111 SLAMS 20140211 14.3

6 19 111 SLAMS 20140212 23.2

6 19 111 SLAMS 20140213 25.1

6 19 111 SLAMS 20140214 43.3

6 19 111 SLAMS 20140215 46.8

6 19 111 SLAMS 20140216 9.9

6 19 111 SLAMS 20140217 6.5

6 19 111 SLAMS 20140218 16.5

6 19 111 SLAMS 201402199

6 19 111 SLAMS 20140220 12.3

6 19 111 SLAMS 20140221 22.5

6 19 111 SLAMS 20140222 24.2

6 19 111 SLAMS 20140223 20.7

6 19 111 SLAMS 20140225 23.2

6 19 111 SLAMS 20140226 13.1

6 19 111 SLAMS 20140227 4.7

6 19 111 SLAMS 20140228 2.2

6 19 111 SLAMS 20140301 2.8

6 19 111 SLAMS 20140302 4.7

6 19 111 SLAMS 20140303 6.2

6 19 111 SLAMS 20140304 3.5

6 19 111 SLAMS 20140305 12.6

6 19 111 SLAMS 20140306 12.8

6 19 111 SLAMS 20140307 11.1

6 19 111 SLAMS 20140308 13.8

6 19 111 SLAMS 20140309 12

6 19 111 SLAMS 20140310 4.9

6 19 111 SLAMS 20140311 4.1
6 19 11

1 SLAMS 20140312 5.7

6 19 111 SLAMS 20140314 6.3

6 19 111 SLAMS 20140315 12.7

6 19 111 SLAMS 20140316 11.9

6 19 111 SLAMS 20140317 4.1

6 19 111 SLAMS 20140318 4.1

6 19 111 SLAMS 20140320 6.9

6 19 111 SLAMS 201403219

6 19 111 SLAMS 20140322 9.9

6 19 111 SLAMS 20140323 8.6

6 19 111 SLAMS 20140324 9.7

6 19 111 SLAMS 20140325 7.5

6 19 111 SLAMS 20140326 3.7

6 19 111 SLAMS 20140327 4.9

6 19 111 SLAMS 201403287

6 19 111 SLAMS 20140329 6.6

6 19 111 SLAMS 20140330 4.3

6 19 111 SLAMS 20140331 4.5
selected SJV sites for PM2.5 2014

Count of 

SAMPLES in 

AQS

Quarters 

in AQS

Estimated 

# samples

rank for 

98th 

percentile

82 1 328 7

84 1 336 7

27 1 108 3

164 2 328 7

30 1 120 3

2014-08-07 (AQS Combined site values report, AMP355)

2.5 Combined site values report 20140807.pdf)
Table showing ONLY valid 24-hour PM2.5 Site Design Value History, 2001-2003 through 2011-2013

local_site_name AQS ID County 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 SouthNorth

BAKERSFIELD - SOUTHEAST (PLANZ) 60290016 Kern 68 54 54 60 68 70 70 65 55 47 60 1

Bakersfield-California Avenue 60290014 Kern 72 61 58 62 66 66 68 62 62 58 65 2

Bakersfield-Golden State Hwy 60290010 Kern 76 62 60 64 69 64 66 64 65 3

Corcoran 60310004 Kings 66 52 55 58 61 52 53 49 46 43 4

Hanford 60311004 Kings 54 60 5

Visalia - N. Church 61072002 Tulare 71 57 55 56 58 57 59 51 47 47 56 6

FRESNO-Pacific College 60195025 Fresno 61 57 57 59 61 52 50 43 48 53 63 7

Fresno - Garland 60190011 Fresno 69 61 60 58 63 58 60 54 58 59 62 8

Clovis 60195001 Fresno 58 51 55 56 58 54 53 47 54 54 58 9

Tranquillity 60192009 Fresno 31 30 10

Madera-City 60392010 Madera 51 52 11

2334 'M' ST. 60472510 Merced 50 47 45 45 48 50 51 45 39 40 49 12

Merced-Coffee 60470003 Merced 43 41 42 13

Turlock 60990006 Stanislaus 55 51 49 53 14

Modesto-14th Street 60990005 Stanislaus 62 54 49 51 55 54 55 49 50 44 51 15

Manteca 60772010 San Joaquin 38 37 16

HAZELTON-HD, STOCKTON 60771002 San Joaquin 50 42 40 41 45 51 50 44 38 36 45 17

1997 PM2.5 24-hour NAAQS 65 65 65 65 65 65 65 65 65 65 65

2006 PM2.5 24-hour NAAQS 35 35 35 35 35 35 35 35 35 35 35

Notes:

Data from U.S. EPA, 2013 Design Value Reports, PM2.5 Detailed Information Updated 8/24/14, available at 

2. Monitoring sites with an annual deesign value status of 'X' hev been determined by EPA to represent unique microscale or middle 

scale locations are not used for comparison to the annual PM2.5 NAAQS. The 2013 revisions to 40 CFR 58 require a formal 

3. For sites with approved seasonal sampling, the promulgated methodology may change the annual 98th percentile and 24-hour 

design value from the values posted on this website in previous years which were calculated under the 2006 NAAQS methodology. 

Data from 2011 and previous years processed using the 2006 rules can be found in the 2011 PM2.5 Detailed Information file posted 

here: http://www.epa.gov/airtrends/values.html. These changes in design values and corresponding changes in the trend are due to 

1. In this table, all design values are calculated based on the rules specified in Appendix N for the 2013 PM2.5 NAAQS. The term 
Disclaimer: The information listed in this report and in these tables is intended for informational use only and does not constitute a 

regulatory determination by EPA as whether an area has a attained a NAAQS. The information set forth in this report has no 

regulatory effect. To have regulatory effect, a final EPA determination as to whether an area has attained a NAAQS or attained a 

NAAQS as of its applicable attainment date can be accomplished only after rulemaking that provides an oppurtunity for notice and 

4. EPA, CARB, and Imperial County APCD are currently discussing various issues concerning the validity of data associated with the 

2011-2013 design values for the Calexico Ethel monitoring site (06-025-0005). 24-hour design values from this site should NOT be 

considered valid for use in a regulatory context until these issues are resolved.
PM2.5 NAAQS, rank in data to use as 98th percentile

40 CFR 50 App. N

4.5 Procedures and Equations for the 24-Hour PM2.5 NAAQS

(a) Table 1... except that where a site operates on an approved seasonal sampling schedule, equation 5

(1) Regular procedure for identifying annual 98th percentile values.

Annual creditable number of 

samples for year ‘‘y’’ (cny)

P0.98, y is the nth maximum 

value of the year, where n is 

the listed number

1–50 1

51–100 2

101–150 3

151–200 4

201–250 5

251–300 6

301–350 7

351–366 8

Table for VLOOKUP()

rank_for_n_samples

1 1

51 2

101 3

151 4

201 5

251 6

301 7

351 8

cny, n_samples P0.98,y, rank from VLOOKUP()

2 1

122 3

328 7

360 8

Table 1
, equation 5