Source/Receptor Area					No. (%) Samples Exceeding Standard		Averages g)
No.	Location	Station No.	No. Days *of Data	Max. Conc. in µg/m 3 24-hour	Federal >150 µg/m3 24-hour	State >50µg/m3 24-hour	AAM Conc. µg/m3	AGM Conc. µg/m3
Los Angeles County
1	Central LA	087	60	141	0	14(23.3)	42.8	36.4
2	NW Coast LA Co	091	--	--	--	--	--
3	SW Coast LA Co	094	58	136	0	8(13.8)	36.2	31.2
4	S Coast LA Co	072	59	146	0	11(18.6)	38.7	32.3
6	W Sn Fernan V	074	--	--	--	--	--
7	E Sn Fernan V	069	59	135	0	15(25.4)	42.2	37.2
8	W Sn Gabrl V	088	--	--	--	--	--
9	E Sn Gabrl V	060/591	60	157	1(1.7)	24(40.0)	49.1	40.8
10	Pomona/Wln V	075/108	61	177	3(4.9)	19(31.1)	46.0	36.6
11	S Sn Gabrl V	085	--	--	--	--	--
12	S Cent LA Co	084	--	--	--	--	--
13	Sta Clarita V	089	61	87	0	13(21.3)	37.0	31.2
14	Antelope V 1)	096	54*	61*	0*	3(5.6)*	22.6*
Orange County
16	N Orange Co	3177	--	--	--	--	--	--
17	Cent Orange Co	3176	60	172	1(1.7)	14(23.3)	43.5	35.9
18	N Coast Orange	3195	--	--	--	--	--	--
19	Saddleback V	3186	60	122	0	11(18.3)	37.6	32.0
Riverside County
22	Norco/Corona	4155	60	177	2(3.3)	28(46.7)	54.2	44.6
23	Metro Riv Co	4144/4146	61	219	4(6.6)	38(62.3)	69.0	51.8
24	Perris Valley	4149	60	145	0	23(38.3)	46.7	36.9
25	Lk Elsinore	4158	--	--	--	--	--	--
26	Temecula V	4163	--	--	--	--	--	--
28	Hemet/Sn Jcnto	4141	--	--	--	--	--	--
29	San Gorgonio P	4150	61	138	0	7(11.5)	30.1	24.5
30	Coachella V 2)	4137/4157	61	199**	1(1.6)**	27(44.3)**	52.0**	47.2**
San Bernardino County
32	NW SB V	5175	--	--	--	--	--	--
33	SW SB V	5171	61	167	3(4.9)	31(50.8)	54.0	44.2
34	Cent SB V	5197/5203	61	178	2(3.3)	35(57.4)	61.0	50.6
35	E SB V	5204	59	172	1(1.7)	24(40.7)	48.4	37.4
37	Cent SB Mtns	5181	59	53	0	1(1.7)	20.4	17.6

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 24 have two monitoring stations each. Values shown are the highest recorded at either station.
µg/m3 - Micrograms per cubic meter of air.
AAM - Annual Arithmetic Mean. AGM - Annual Geometric Mean.
-- = Pollutant not monitored.
* Less than 12 full months of data. May not be representative.
** Includes one high wind natural event day.
1) Mojave Desert Air Basin.
2) Salton Sea Air Basin.
e) PM10 samples were collected every 6 days using the size-selective inlet high volume sampler with quartz filter media.
(PM10 refers to the finer suspended particles, consisting of particles with diameter less than approximately 10 micrometers.)
g) Federal PM10 standard is AAM > 50 µg/m3; state standard is AGM > 30 µg/m3.

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Last Update 9/11/97
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