DEL jJ
NORTE
SHASTA
TRINITY
HUMBOLDT
C^L I FQ/R(N I A
Mendocino
J\K~
SONOMA
SANTA

EPA REGION 9 2009-2011 SULFUR DIOXIDE (S02)
MONITORING SITE DESIGN VALUES*
COMPARED TO THE 75 PARTS PER BILLION (PPB) 2010 1-HOUR S02
NATIONAL AMBIENTAIR QUALITY STANDARD (NAAQS)
Valid monitoring site >NAAQS
Invalid monitoring site >NAAQS
Valid monitoring site < NAAQS
Invalid monitoring site < NAAQS

AIR1200084_12.mxd
Thursday, September 13, 2012
REGION 9 - AIR
'NAPA y^SOtAN©
;rmie
SACRAMENTO-
san .
° 7 JOAQUIN
.AM EDA
•STANISLAUS"
NT$.
CRii'Z-
N
0 25
H-h
100 Miles

H A WA I I
4
GUAM
.AiiDER
EUREKA
WHITE
PINE
CHURCHILL
MINERAL
CALAVERAS
TUOLUMNE
i.-.jfK:
ESMERALDA
MARIPOSA
J'.' :¦ .l'i
MERCED
MADERA
- K-S NO
SAN
NITO

i' I-A Kb
COCONINO
MONTEREY
r0 f JGS
MOHAVE
AR ZONA
NAVAJO
SAN LUIS
OBISPO

SAN
BERNARDINO
YAVAPAI
SANTA
BARBARA
VENTURA
% *
LA PAZ
JRANGE
RIVERSIDE
MARICOPA
:-w£HA ,

IMPERIAL
SAN
DIEGO
YUMA
Pi MA
OO'wHlSE
SANTA
CRUZ
EL DORADO

"Design values are preliminary; monitor type and/or
sampling frequency have not been reviewed. Validity based
on completeness of S02 monitoring data in AQS within the 2009-2011 time period.

-------