California

• Alameda County
• San Jose-San Francisco-Oakland, CA

High Ozone Days		Learn More
Ozone Grade:	F	How is my grade calculated?
Weighted Average:	4.8	Change Since 1996: 14.2 4.8 fewer days this year
View Orange, Red, and Purple Ozone Days Orange Ozone Days: 13 What do the colors mean? Red Ozone Days: 1 What do the colors mean? Purple Ozone Days: 0 What do the colors mean?
Particle Pollution - 24 Hour		Learn More
Grade:	D	How is my grade calculated?
Weighted Average:	3.0	Change Since 2000: 5.2 3.0 fewer days this year
View Orange, Red, and Purple Particle Pollution Days Orange Particle Days: 9 What do the colors mean? Red Particle Days: 0 What do the colors mean? Purple Particle Days: 0 What do the colors mean?
Particle Pollution - Annual		Learn More
Grade:	Pass	How is my grade calculated?
Design Value	9.4	Change Since 2000: 12.3 9.4 µg/m3
Groups At Risk		Learn More
Total Population:	1,491,482	Risks to the population
Pediatric Asthma:	22,864	Risks to people with Asthma
Adult Asthma:	90,064	Risks to people with Asthma
Chronic Bronchitis:	48,579	Risks to people with Chronic Bronchitis
Emphysema:	22,624	Risks to people with Emphysema
Cardiovascular Disease:	397,146	Risks to people with Cardiovascular Disease
Diabetes:	104,315	Risks to people with Diabetes
Children Under 18:	344,679	Risks to children and teens
Adults 65 & Over:	162,522	Risks to older adults
Poverty Estimate:	158,531	Risks to people with low incomes

Alameda	06001	F	13	1	0	D	3.0	9	0	0	0	Pass	9.4	1491482	344679	162522	22864	90064	48579	22624	771	397146	104315	158531	14.2	12.7	13.2	9.2	5.8	6.3	5.7	4	5.7	5	6.5	4.8	5.2	4.5	2.7	1.3	2	2	2.7	3.0	12.3	11.6	11	9.4	9.7	9.4	9.6	9.4

Contra Costa	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	contra-costa-06013.html	06013	4.3	F	13	0	0	F	4.0	12	0	0	0	Pass	8.7	1041274	259082	126828	17186	61367	34463	17043	538	289409	77083	97510	10.8	9.2	10.5	8.2	7.3	8	6.2	4.7	6.7	5.7	8	4.3	9	9	8	7.5	7.5	6	5.7	4.0	11.3	10.9	11	0	9.7	8.9	9	8.7
Marin	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	marin-06041.html	06041	0.0	A	0	0	0	DNC	0	0	0	0		Dnc	0	250750	51078	40694	3388	15603	9301	5035	130	81394	21996	17647	0.3	0.3	0.3	0.3	0	0	0	0	0	0	0	0.0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Napa	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	napa-06055.html	06055	1.0	C	3	0	0	DNC	0	0	0	0		Dnc	0	134650	31455	19941	2087	8055	4632	2423	70	39854	10621	11187	0.8	2.5	2.5	2	0.7	1.7	1.3	1	0	0	0.7	1.0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
San Benito	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	san-benito-06069.html	06069	5.0	F	15	0	0	A	0.0	0	0	0	0	Pass	6.2	55058	15906	5110	1055	3083	1663	762	29	13513	3566	7573	18.7	11.5	12.8	9.7	13.3	13.3	12.3	5.3	4.3	3.7	7	5.0	0	0	0	0	0	0	0	0.0	0	0	0	0	0	0	0	6.2
San Francisco	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	san-francisco-06075.html	06075	0.0	A	0	0	0	C	1.7	5	0	0	0	Pass	9.4	815358	117695	114294	7807	54486	29283	14044	423	241955	62853	94134	0	0	0	0	0	0	0	0	0	0	0	0.0	10.7	10	7.3	5	4.3	4.7	2.7	1.7	12	11.6	11	9.9	9.7	9.3	9.4	9.4
San Mateo	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	san-mateo-06081.html	06081	0.0	A	0	0	0	B	0.3	1	0	0	0	Pass	8.7	718989	160428	94255	10642	43738	24475	12180	372	205956	54613	54268	0	0	0	0	0	0.7	0.7	0.7	0	0	0	0.0	2.8	2.2	0.3	0.3	0.8	0.8	0.8	0.3	11.2	10.6	9.9	9	9.2	8.9	9	8.7
Santa Clara	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	santa-clara-06085.html	06085	4.5	F	12	1	0	F	5.0	15	0	0	0	Pass	10.8	1784642	436221	194995	28937	105776	56769	26441	927	463876	121353	159677	14	10.3	10.5	6.2	4.8	7	6.5	5.3	6.5	5.2	6	4.5	13.8	8.7	6.7	14	13	11	7	5.0	11.8	11.1	10.8	11.7	11.4	11.1	11	10.8
Santa Cruz	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	santa-cruz-06087.html	06087	0.0	A	0	0	0	A	0.0	0	0	0	0	Pass	6.3	256218	55780	28426	3700	15763	8632	4071	133	71010	18808	34268	1.3	0.3	0.7	0.3	0.7	0.3	0.7	0.3	0.3	0	0	0.0	0	0	0	0	0	0	0	0.0	8.5	8.4	7.6	0	0	0	6.7	6.3
Solano	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	solano-06095.html	06095	3.3	F	10	0	0	F	5.3	16	0	0	0	Pass	9.8	407234	102344	46804	6789	23930	13214	6377	211	109749	29066	42135	12.7	12.7	12.7	7.5	3.7	3.3	3.7	3	5	4.3	5.7	3.3	4.2	3.2	1.8	2.3	3	3	4.3	5.3	12.6	11.8	11.3	10	10.2	9.8	9.8	9.8
Sonoma	San Jose-San Francisco-Oakland, CA	San-Jose-San-Francisco-Oakland-CA.html	sonoma-06097.html	06097	0.0	A	0	0	0	A	0.0	0	0	0	0	Pass	8.2	472102	104634	64482	6941	28782	16416	8351	244	139583	37288	44093	2.7	4.3	3.3	2.3	0.3	0.3	0.7	0.7	0.3	0	0	0.0	2.5	2.5	1	0.3	0.3	0.3	0.3	0.0	10.5	10	9.2	8.2	8.3	8.1	8.4	8.2

Ranked 93 for high ozone days out of 277 metropolitan areas Ranked 24 for 24-hour particle pollution out of 277 metropolitan areas Ranked 123 for annual particle pollution out of 277 metropolitan areas Take Action | Support Clean Air | Local Air Quality Contact Your Local Lung Association: California Compare Your Air Select Your State Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Select your City Albany, GA Albany-Corvallis-Lebanon, OR Albany-Schenectady-Amsterdam, NY Albuquerque, NM Alexandria, LA Allentown-Bethlehem-Easton, PA-NJ Altoona, PA 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High Ozone Days	Learn More
	Change Since This County: Alameda, CA Other counties with monitors in this metropolitan area There are no other counties in this metropolitan area What is my length? 11 Contra Costa, CA Marin, CA Napa, CA San Benito, CA San Francisco, CA San Mateo, CA Santa Clara, CA Santa Cruz, CA Solano, CA Sonoma, CA A B C D F DNC INC
Particle Pollution - 24 Hour	Learn More
	Change Since This County: Alameda, CA Other counties with monitors in this metropolitan area There are no other counties in this metropolitan area Contra Costa, CA Marin, CA Napa, CA San Benito, CA San Francisco, CA San Mateo, CA Santa Clara, CA Santa Cruz, CA Solano, CA Sonoma, CA A B C D F DNC INC
Particle Pollution - Annual	Learn More
	Change Since This County: Alameda, CA Other counties with monitors in this metropolitan area There are no other counties in this metropolitan area Contra Costa, CA Marin, CA Napa, CA San Benito, CA San Francisco, CA San Mateo, CA Santa Clara, CA Santa Cruz, CA Solano, CA Sonoma, CA PASS FAIL DNC INC

Groups At Risk		Learn More
Total Population:		Risks to the population
Pediatric Asthma:		Risks to people with Asthma
Adult Asthma:		Risks to people with Asthma
Chronic Bronchitis:		Risks to people with Chronic Bronchitis
Emphysema:		Risks to people with Emphysema
Cardiovascular Disease:		Risks to people with Cardiovascular Disease
Diabetes:		Risks to people with Diabetes
Children Under 18:		Risks to children and teens
Adults 65 & Over:		Risks to older adults
Poverty Estimate:		Risks to people with low incomes

Notes:

(1) INC indicates incomplete monitoring data for all three years. Therefore, those counties are excluded from the grade analysis.
(2) DNC indicates that there is no monitor collecting data in the county.

More about Methodology.