San Mateo

View Orange, Red, and Purple Ozone Days

Orange Ozone Days:	0	What do the colors mean?
Red Ozone Days:	0	What do the colors mean?
Purple Ozone Days:	0	What do the colors mean?

Particle Pollution - 24 Hour Learn More Grade: C How is my grade calculated? Weighted Average: 1.3 Change Since 2000:

3.8

1.3

fewer days this year

View Orange, Red, and Purple Particle Pollution Days

Orange Particle Days:	4	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 9.3 Change Since 2000:

11.2

9.3

µg/m³

Groups At Risk Learn More Total Population: 747,373 Risks to the population Pediatric Asthma: 14,360 Risks to people with Asthma Adult Asthma: 51,576 Risks to people with Asthma COPD: 28,395 Risks to people with COPD Cardiovascular Disease: 41,921 Risks to people with Cardiovascular Disease Diabetes: 62,945Risks to people with Diabetes Children Under 18: 162,100 Risks to children and teens Adults 65 & Over: 107,247 Risks to older adults Poverty Estimate: 58,932Risks to people with low incomes

The air you breathe needs your support.

You can make a difference in the air that you breathe.

Take Action for Healthier Air

Tell us why having healthy air matters to you.

Alameda	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	alameda.html	06001	2.0	C	6	0	D	2.7	8	0	0	Pass	10.0	1578891	343177	191838	30402	107985	56443	81383	123422	201303	14.2	12.7	13.2	9.2	5.8	6.3	5.7	4.0	5.7	5.0	6.5	4.8	5.7	4.2	3.2	2.0	8.2	6.0	4.2	1.0	1.7	2.0	2.7	3.0	2.0	2.3	1.0	2.7	12.3	11.6	11.0	9.4	9.7	9.4	9.6	9.4	9.0	9.0	9.1	10.0
Contra Costa	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	contra-costa.html	06013	2.0	C	6	0	C	1.3	4	0	0	Pass	7.4	1094205	260619	151134	23088	73658	40713	60040	90505	116977	10.8	9.2	10.5	8.2	7.3	8.0	6.2	4.7	6.7	5.7	8.0	4.3	5.3	3.3	3.3	2.0	14.3	11.7	12.7	7.2	7.3	5.8	5.3	3.8	2.2	1.7	1.3	1.3	11.3	10.9	11.0		9.7	8.9	9.0	8.7	8.3	7.8	7.2	7.4
Marin	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	marin.html	06041	0.0	A	0	0	C	1.0	3	0	0	Pass	9.5	258365	53188	48867	4712	18428	11188	17156	25425	21784	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										1.7	1.7	1.0											9.5	9.5
Napa	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	napa.html	06055	0.3	B	1	0	Inc					Inc		140326	31280	23096	2771	9638	5511	8305	12295	13141	0.8	2.5	2.5	2.0	0.7	1.7	1.3	1.0	0.0	0.0	0.7	1.0	1.7	1.0	0.7	0.3
San Benito	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	san-benito.html	06069	0.3	B	1	0	A	0.0	0	0	0	Pass	5.5	57600	15825	6259	1402	3670	1930	2774	4246	7260	18.7	11.5	12.8	9.7	13.3	13.3	12.3	5.3	4.3	3.7	7.0	5.0	4.7	0.7	1.0	0.3								0.0	0.0	0.0	0.0	0.0								6.2	6.1	5.6	5.4	5.5
San Francisco	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	san-francisco.html	06075	0.0	A	0	0	C	1.7	5	0	0	Pass	9.2	837442	112255	118910	9945	62847	32531	47169	70474	113217	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	15.0	14.7	11.2	5.0	4.3	4.7	2.7	2.0	1.3	2.0	2.0	1.7	12.0	11.6	11.0	9.9	9.7	9.3	9.4	9.4	10.0	9.9	9.4	9.2
San Joaquin	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	san-joaquin.html	06077	8.8	F	25	1	F	21.3	43	14	0	Fail	13.8	704379	198720	80542	17604	44161	23160	33502	50634	137451	21.2	17.5	18.3	15.2	12.5	14.2	12.3	7.8	10.7	10.2	15.5	10.5	9.8	6.8	9.5	8.8	12.0	8.7	7.2	4.5	5.2	7.8	9.7	9.0	7.0	11.5	12.3	21.3	15.3	14.7	14.5	13.1	12.9	12.8	13.5	12.9	12.1	11.1	11.4	13.8
San Mateo	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	san-mateo.html	06081	0.0	A	0	0	C	1.3	4	0	0	Pass	9.3	747373	162100	107247	14360	51576	28395	41921	62945	58932	0.0	0.0	0.0	0.0	0.0	0.7	0.7	0.7	0.0	0.0	0.0	0.0	0.3	0.3	0.3	0.0	3.8	2.8	1.3	0.3	0.8	0.8	0.8	0.3	0.3	0.7	0.7	1.3	11.2	10.6	9.9	9.0	9.2	8.9	9.0	8.7			8.5	9.3
Santa Clara	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	santa-clara.html	06085	0.7	B	2	0	F	4.2	11	1	0	Pass	10.5	1862041	435695	222803	38598	124653	65241	94147	142695	191898	14.0	10.3	10.5	6.2	4.8	7.0	6.5	5.3	6.5	5.2	6.0	4.5	6.8	5.0	2.7	0.7	20.8	14.3	13.3	13.8	12.8	11.3	7.3	5.2	3.0	2.7	3.0	4.2	11.8	11.1	10.8	11.7	11.4	11.1	11.0	10.8	10.2	9.6	9.3	10.5
Santa Cruz	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	santa-cruz.html	06087	0.0	A	0	0	F	7.0	21	0	0	Pass	6.3	269419	55179	34494	4888	18783	9962	14442	21888	38447	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	7.0	8.5	8.4	7.6				6.7	6.3	6.3	6.2	6.2	6.3
Solano	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	solano.html	06095	0.7	B	2	0	F	5.3	16	0	0	Pass	9.6	424788	98930	55134	8764	28695	15524	22672	34327	53441	12.7	12.7	12.7	7.5	3.7	3.3	3.7	3.0	5.0	4.3	5.7	3.3	4.0	2.3	2.0	0.7	7.3	5.3	3.8	2.0	2.7	3.0	4.3	5.3	4.0	3.7	2.3	5.3	12.6	11.8	11.3	10.0	10.2	9.8	9.8	9.8	9.1	9.1	8.8	9.6
Sonoma	San Jose-San Francisco-Oakland, CA	san-jose-san-francisco-oakland-ca.html	sonoma.html	06097	0.0	A	0	0	A	0.0	0	0	0	Pass	8.4	495025	103636	79183	9181	34673	19722	29534	44065	60216	2.7	4.3	3.3	2.3	0.3	0.3	0.7	0.7	0.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	5.5	3.8	2.0	0.3	0.5	0.5	0.5	0.0	0.0	0.0	0.0	0.0	10.5	10.0	9.2	8.2	8.3	8.1	8.4	8.2	8.0	8.0	8.0	8.4

Ranked 36 for high ozone days out of 220 metropolitan areas
Ranked 6 for 24-hour particle pollution out of 220 metropolitan areas
Ranked 7 for annual particle pollution out of 220 metropolitan areas

Take Action | Support Clean Air | Local Air Quality

Contact Your Local Lung Association:

Compare Your Air

High Ozone Days

Learn More

Change Since

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

Alameda, CA

Contra Costa, CA

Marin, CA

Napa, CA

San Benito, CA

San Francisco, CA

San Joaquin, CA

San Mateo, CA

Santa Clara, CA

Santa Cruz, CA

Solano, CA

Sonoma, CA

DNC

INC

Particle Pollution - 24 Hour

Learn More

Change Since

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

Alameda, CA

Contra Costa, CA

Marin, CA

Napa, CA

San Benito, CA

San Francisco, CA

San Joaquin, CA

San Mateo, CA

Santa Clara, CA

Santa Cruz, CA

Solano, CA

Sonoma, CA

DNC

INC

Particle Pollution - Annual

Learn More

Change Since

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

Alameda, CA

Contra Costa, CA

Marin, CA

Napa, CA

San Benito, CA

San Francisco, CA

San Joaquin, 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
COPD:		Risks to people with COPD
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

More about Methodology.

View Orange, Red, and Purple Ozone Days

View Orange, Red, and Purple Particle Pollution Days

The air you breathe needs your support.

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

This County:

San Mateo, CA

Other counties with monitors in this metropolitan area

There are no other counties in this metropolitan area

Make a Donation

Sign Up for Our Newsletter

Join Our Fight

Find A Location