Source/Receptor Area			No. Days of Data	Max. Conc.in ppm 1-hour	Max. Conc. in ppm 24- hour	Average Compared to Federal Standard c)	No. Days Std.Exc'd State
No.	Location	Station No.				AAM in ppm	>.25/>.04 ppm 1/24-hr d)
Los Angeles County
1	Central LA	087	365	.01	.010	.0010	0/0
2	NW Coast LA Co	091	--	--	--	--	--
3	SW Coast LA Co	094	365	.06	.012	.0027	0/0
4	S Coast LA Co	072	365	.14	.018	.0023	0/0
6	W Sn Fernan V	074	--	--	--	--	--
7	E Sn Fernan V	069	365	.01	.005	.0001	0/0
8	W Sn Gabrl V	088	--	--	--	--	--
9	E Sn Gabrl V	060/591	--	--	--	--	--
10	Pomona/Wln V	075/108	--	--	--	--	--
11	S Sn Gabrl V	085	--	--	--	--	--
12	S Cent LA Co	084	362	.03	.013	.0030	0/0
13	Sta Clarita V	089	--	--	--	--	--
14	Antelope V 1)	096	--	--	--	--	--
Orange County
16	N Orange Co	3177	365	.02	.010	.0009	0/0
17	Cent Orange Co	3176	--	--	--	--	--
18	N Coast Orange	3195	365	.02	.009	.0007	0/0
19	Saddleback V	3186	--	--	--	--	--
Riverside County
22	Norco/Corona	4155	--	--	--	--	--
23	Metro Riv Co	4144/4146	365	.01	.006	.0001	0/0
24	Perris Valley	4149	--	--	--	--	--
25	Lk Elsinore	4158	--	--	--	--	--
26	Temecula V	4163	--	--	--	--	--
28	Hemet/Sn Jcnto	4141	--	--	--	--	--
29	San Gorgonio P	4150	--	--	--	--	--
30	Coachella V 2)	4137/4157	--	--	--	--	--
San Bernardino County
32	NW SB V	5175	--	--	--	--	--
33	SW SB V	5171	--	--	--	--	--
34	Cent SB V	5197/5203	364	.02	.010	.0006	0/0
35	E SB V	5204	--	--	--	--	--
37	Cent SB Mtns	5181	--	--	--	--	--

ABBREVIATIONS USED IN AREA NAMES: LA = Los Angeles SB = San Bernardino Riv = Riverside Co = County
N = North S = South W = West E = East
V = Valley Lk = Lake P = Pass Cent = Central
Areas 9, 10, 23, 30 and 34 have two monitoring stations each. Values shown are the highest recorded at either station.
"No. Days of Data" for the areas with two stations is based on the annual average (if reported) or the number of days above state standard.
ppm - Parts Per Million parts of air, by volume. AAM = Annual Arithmetic Mean
-- = Pollutant not monitored.
1) Mojave Desert Air Basin.
2) Salton Sea Air Basin.
c) The federal standard is annual arithmetic mean SO2 greater than 80 µg/m3 (0.03 ppm). No location exceeded this standard.
The other federal standards (3-hour average > 0.50 ppm, and 24-hour average > 0.14 ppm) were not exceeded either.
d) Days maximum 1-hour average SO2 or 24-hour moving average SO2 exceeded state standards (1-hour > 0.25 ppm/24-hour > 0.04 ppm).

Return to 1995 Air Quality and Trends Page

AQMD Home Page

Last Update: 9/11/97
URL: http://www.aqmd.gov/smog/95so2html