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 of data that is behind the graph I sent you earlier.

Let me know if you 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 graph just shows that max value has moved around, right? So I’m curious why Redlands didn’t show up for 2012

or 2013 — I thought the DV monitor had changed from crestline to Redlands in the past year or two. 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 for the 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

1
To: 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\ AIR1400027_SMT.xlsx. Following are charts for the four areas:

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US EPA REGION 9 AIR QUALITY TRENDS, 1985-2

PARTICULATE MATTER (PM10)DESIGN VALUE

FOR SELECT AREAS IN CALIFORNIA

40

• Los Angeles-South Coast Air Basin. CA

S Riverside County (Coacheila Valley). CA

30

-

a. San Francisco Bay Area, CA

25

1 Sanloaquin Valley. CA

201224-hourPM1ONAAQS

115

Source: US EPA’s ?ir Quality Systems (AQS) database (Febmarv24.2014).

The 2012 24-hour national ambient air quality standard (NAAQS) forparticulate matter (PM1)is notto exceed one estimated exce

per cubic meterIagn1 5:per year on average over a 3-year period. X-axis labels represent thelast year ofa monitors 3-year time pe:

(e.g, high hids andwild&es) thatEPA hasconcurred onhavebeenexcludedfromdesign value calculations. There areno valid

selectednonattainment areasData from 2013 are preliminary and have not been reviewed by EPA.

3
US 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 9national 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

• Los Angeles-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 75 parts per billion (

calculation ofeachvears 4th-highest davsrecorded values, averaged over a 3 -vearpeffod at an air quality monitor- X-ains labels r

monitors3 yeartime period All exceptionaleventdata (e.g., high winds andwildfires) thatEPA hasconcuned onhavebeenexclu

calculations. Code of Federal Regulations rounding conventions set the 1997 S-hour ozoneNAAQS at 85 pp& Values for the Rive

C.-i nonattainment area are invalidin 1989 and 1990 due to incomplete data- Data from 2013 are preliminary and have not been

Please let me know what you think.

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 Protection Agency

Air Quality Analysis Office (AIR-7)

75 Hawthorne Street

San Francisco, CA 94105

5
9

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