### Tax, Wienke From: Flagg, MichaelA 

### Sent: Wednesday, February 26, 2014 11:18AM 

### To: Tax, Wienke Subject: RE: 1-hour ozone long-term trend

- quick question 

### Attachments: SouthCoast_1 HourMax_1 990-201 3.xlsx Wienke, Here is the table ofdata that is behind the graph I sent you earlier. Let me know ifyou have question. Michael Flagg EPA Region 9 Air Quality Analysis Office P: 415.972.3372 E: Flagg.MichaelA@epa.gov 

### From: Tax, Wienke 

### Sent: Wednesday, February 26, 2014 10:53 AM 

### To: Flagg, MichaelA Subject: RE: 1-hour ozone long-term trend

- quick question Second graphjust shows that max value has moved around, right? So I’m curious why Redlands didn’t show up for 2012 or 2013

— I thoughtthe DV monitor had changed from crestline to Redlands in the pastyear ortwo. Or is that not showing up yet b/c the DV monitor is on a 3 year basis? Thanks wienke 

### From: Flagg, MichaelA 

### Sent: Tuesday, February 25, 2014 3:34 PM 

### To: Tax, Wienke Subject: RE: 1-hour ozone long-term trend Wienke, Attached is a dcc that contains 2 graphs (1) max values forthe area (2) max values for area + data from sites that measured maximum value during the 1990-2013 timeframe. Hope this helps! Michael Flagg EPA Region 9 Air Quality Analysis Office P: 415.972.3372 E: Flagg.MichaelA@epa.gov 

### From: Tax, Wienke 

### Sent: Tuesday, February 25, 2014 9:12 AM 1To: Flagg, MichaelA Subject: FW: 1-hour ozone long-term trend

Michael

— I can use the 1-hour graph below for today’s briefing paper. Would still appreciate a max value graph if you have time. From: Kurpius, Meredith Sent: Tuesday, February 25, 2014 9:05 AM To: Lakin, Matt; Glosson, Niloufar; Flagg, MichaelA; YOSHIMURA, GWEN; Adams, Elizabeth; Tax, Wienke; Clover, Fletcher; Lo, Doris Subject: 1-hour ozone long-term trend See the 2 figure for the long-term ozone trend in Sc. I agree with Matt that it is impressive. From: Clover, Fletcher Sent: Monday, February 24, 2014 3:56 PM To: Kurpius, Meredith Cc: Flagg, MichaelA; Felix, Elfego; Hoag, Katherine; YOSHIMURA, GWEN; Williams, Jennifer; Vallano, Dena Subject: Ready for review: PM1O, 1-hour ozone and 8-hour ozone trend charts for SJV, SF, SC and Coachella areas Hi Meredith, In preparation for the SMT meeting, I have finished preliminary versions of trend charts for each of the four areas you requested, for 1985-2013. I have not included the spreadsheet due to file size; I have posted a copy at G:\ALR-7\Graphics\Maps\20 14\ AIR 1400027_SMT.xlsx. Following are charts for the four areas: 2

## US EPA REGION 9 AIR QUALITY TRENDS, 1985-2 PARTICULATE MATTER (PM 10 ) DESIGN VALUE FOR SELECT AREAS IN CALIFORNIA 40 ____



## • LosAngeles-South CoastAirBasin. CA S RiversideCounty (Coacheila Valley). CA 

### 30 ___

- 

## a. SanFrancisco BayArea, CA 25 

## ______________________ ___________

1 

### Sanloaquin Valley. 

### CA 201224-hourPM1ONAAQS

115 __

Source: US EPA’s ?ir Quality Systems (AQS) database (Febmarv24.2014). The 2012 24-hournationalambientairquality standard(NAAQS) forparticulatematter

### (PM 1 ) is notto exceed one estimatedexce percubic meterIagn1 5 : peryearon average overa3-yearperiod. X-axis labels representthelastyear ofamonitors 3-yeartime

### pe: (e.g, 

### high hids andwild&es) thatEPAhasconcurred onhavebeenexcludedfromdesignvalue calculations. There areno valid selectednonattainment areasData from2013 are preliminaryand have notbeen reviewedbyEPA.

3US EPA REGION 9 AIR QUALITY TRENDS, 1985-2( 1-HOUR OZONE DESIGN VALUES FOR SELECT AREAS IN ( 120 100 80

- a

160 140

• LosAngeles-South Coast Air Basin CA • Riverside County (Coachella Vallev) CA a. San Francisco Bay Area CA San Joaquin Valle CA 1979 1-hour ozone NAAQS — — — — UI 2010 2011 /\_ % Source: US EPA’s Air Quality Systems (AQS) database (February 24.2014:’. The 1 9 national ambient air quality standard (NAAQS) level for 1-hour ozone is 0.1 parts per rniiiion (ppm), andwas revoked attainedwhenthe expectednumber ofdavsper calendarvearith maximumhourlv average concentration greaterthan 0J2 ppm, three-vearpenod, is equal to or less than 1 The air qualitvmonitor thathasthe highest design value for eachvearin a nonattainm

labelsrepresent the last year of a monitors 3 year time period. All exceptional event data (eg, high winds andwildres) that EP. excluded from design value calculations. Data from 2013 are preliminary and have not been reviewed by EPA. 4

### US EPA REGION 9 AIR QUALITY TRENDS, 1985-2 8-HOUR OZONE DESIGN VALUES FOR SELECT AREAS IN ( 25C 

### ___________________________

• LosAngeles-South Coa



### < 100

F 1 C

- 

### 50

-____________ _______ ___ ______



### 0 I 

### y r \ ‘, , Source: US EPAs Air Quality Systems IAQS) database (Februarv&2014) The00Snationalambientairqualitvstandard(NAAQS) for S-hour ozoneis 0.E75 partspernilllion (ppm\ or 75partsperbillion 

### ( calculationofeachvears4th-highest davsrecordedvalues, averagedover a3-vearpeffod atanairqualitymonitor- X-ains labels r monitors3 yeartimeperiod All exceptionaleventdata (e.g.,high winds andwildfires) thatEPAhasconcuned onhavebeenexclu calculations. Code ofFederalRegulationsrounding conventions setthe 1997 S-hour ozoneNAAQS at 85 pp&Values forthe

### Rive C.-inonattainmentarea areinvalidin 1989 and 1990 dueto incomplete data-Datafrom 2013 arepreliminaryand have not been 

### Please letme 

### know what youthink. Thanks! Fletcher Page Clover Air Quality Analysis Office Environmental Protection Agency, Region 9 Phone: 415.972.3991 Email: clover.t1etcher(2iepa.gov mailing address: U.S. 

### Environmental ProtectionAgency Air Quality Analysis Office (AIR-7) 75 Hawthorne Street San Francisco, CA 94105 59

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