WorldArrow icon
Arrow iconSan Mateo County

Air quality in San Mateo County

Air quality index (AQI⁺) and PM2.5 air pollution in San Mateo County • 13 Followers • 12:00, Apr 17

22

US AQI⁺

Good

face expression based on aqi value

Main pollutant:

PM2.5

3.9 µg/m³

weather condition icon

16°

wind direction icon

15 km/h

weather humid icon

36 %

Hourly forecast

San Mateo County air quality index (AQI⁺) forecast

Now

22

Weather icon

16°

IQAir AirVisual Air Quality Map Wind rotating 28 degree

15

km/h

Humidity icon

36%

13:00

21

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 9 degree

14

km/h

Humidity icon

33%

14:00

21

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 345 degree

13

km/h

Humidity icon

31%

15:00

21

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 327 degree

14

km/h

Humidity icon

39%

16:00

21

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 312 degree

14

km/h

Humidity icon

54%

17:00

22

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 303 degree

12

km/h

Humidity icon

60%

18:00

22

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 299 degree

13

km/h

Humidity icon

54%

19:00

22

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 283 degree

9

km/h

Humidity icon

68%

20:00

23

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 255 degree

5

km/h

Humidity icon

77%

21:00

24

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 248 degree

5

km/h

Humidity icon

72%

22:00

24

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 249 degree

6

km/h

Humidity icon

83%

23:00

30

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 220 degree

4

km/h

Humidity icon

90%

Sat

00:00

31

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 237 degree

5

km/h

Humidity icon

90%

01:00

31

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 230 degree

4

km/h

Humidity icon

98%

02:00

39

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 168 degree

1

km/h

Humidity icon

97%

03:00

39

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 151 degree

2

km/h

Humidity icon

72%

04:00

39

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 123 degree

3

km/h

Humidity icon

64%

05:00

48

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 115 degree

2

km/h

Humidity icon

54%

06:00

48

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 107 degree

2

km/h

Humidity icon

47%

07:00

48

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 108 degree

3

km/h

Humidity icon

39%

08:00

43

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 104 degree

3

km/h

Humidity icon

37%

09:00

43

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 95 degree

1

km/h

Humidity icon

61%

10:00

43

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 67 degree

1

km/h

Humidity icon

60%

11:00

36

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 318 degree

2

km/h

Humidity icon

62%

12:00

36

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 310 degree

4

km/h

Humidity icon

62%

13:00

36

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 292 degree

5

km/h

Humidity icon

64%

14:00

34

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 272 degree

5

km/h

Humidity icon

65%

15:00

34

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 252 degree

6

km/h

Humidity icon

62%

16:00

34

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 230 degree

7

km/h

Humidity icon

59%

17:00

29

Weather icon

16°

IQAir AirVisual Air Quality Map Wind rotating 218 degree

8

km/h

Humidity icon

63%

18:00

29

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 213 degree

8

km/h

Humidity icon

59%

19:00

29

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 214 degree

7

km/h

Humidity icon

62%

20:00

28

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 205 degree

5

km/h

Humidity icon

67%

21:00

28

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 188 degree

5

km/h

Humidity icon

67%

22:00

28

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 166 degree

4

km/h

Humidity icon

63%

23:00

38

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 165 degree

5

km/h

Humidity icon

59%

Sun

00:00

38

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 173 degree

5

km/h

Humidity icon

60%

01:00

38

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 178 degree

6

km/h

Humidity icon

56%

02:00

48

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 175 degree

6

km/h

Humidity icon

53%

03:00

48

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 199 degree

6

km/h

Humidity icon

55%

04:00

48

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 197 degree

7

km/h

Humidity icon

69%

05:00

46

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 184 degree

7

km/h

Humidity icon

54%

06:00

46

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 198 degree

7

km/h

Humidity icon

51%

07:00

46

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 207 degree

8

km/h

Humidity icon

69%

08:00

49

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 220 degree

8

km/h

Humidity icon

74%

09:00

49

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 212 degree

6

km/h

Humidity icon

69%

10:00

49

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 204 degree

5

km/h

Humidity icon

54%

11:00

35

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 208 degree

6

km/h

Humidity icon

56%

12:00

35

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 218 degree

6

km/h

Humidity icon

56%

13:00

35

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 222 degree

9

km/h

Humidity icon

61%

14:00

29

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 218 degree

11

km/h

Humidity icon

70%

15:00

29

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 225 degree

12

km/h

Humidity icon

67%

16:00

29

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 224 degree

14

km/h

Humidity icon

59%

17:00

28

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 223 degree

15

km/h

Humidity icon

51%

18:00

28

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 225 degree

13

km/h

Humidity icon

47%

19:00

28

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 221 degree

11

km/h

Humidity icon

64%

20:00

27

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 204 degree

9

km/h

Humidity icon

77%

21:00

27

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 188 degree

8

km/h

Humidity icon

77%

22:00

27

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 186 degree

7

km/h

Humidity icon

71%

23:00

29

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 175 degree

8

km/h

Humidity icon

64%

Mon

00:00

29

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 192 degree

8

km/h

Humidity icon

60%

01:00

29

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 174 degree

9

km/h

Humidity icon

61%

02:00

23

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 163 degree

10

km/h

Humidity icon

70%

03:00

23

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 161 degree

10

km/h

Humidity icon

77%

04:00

23

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 155 degree

10

km/h

Humidity icon

83%

05:00

21

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 154 degree

10

km/h

Humidity icon

84%

06:00

21

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 160 degree

9

km/h

Humidity icon

81%

07:00

21

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 163 degree

8

km/h

Humidity icon

75%

08:00

19

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 154 degree

8

km/h

Humidity icon

57%

09:00

19

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 158 degree

12

km/h

Humidity icon

38%

10:00

19

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 173 degree

15

km/h

Humidity icon

31%

11:00

16

Weather icon

18°

IQAir AirVisual Air Quality Map Wind rotating 184 degree

19

km/h

Humidity icon

28%

Daily forecast

|

San Mateo County air quality index (AQI⁺) forecast

Today

21

Weather icon

18°

10°

IQAir AirVisual Air Quality Map Wind rotating 45 degree

22

km/h

Humidity icon

49%

Sat

35

Weather icon

18°

10°

IQAir AirVisual Air Quality Map Wind rotating 90 degree

8

km/h

Humidity icon

59%

Sun

38

Weather icon

15°

10°

IQAir AirVisual Air Quality Map Wind rotating 225 degree

15

km/h

Humidity icon

63%

Air pollutants

What is the current air quality in San Mateo County?

IQAir Check icon

PM2.5 concentration currently meets the WHO annual PM2.5 guideline.

air quality map

Real-time San Mateo County air pollution map

Health recommendations

common.healthRecommendationComp.icons.exerciseAlt

Enjoy outdoor activities

common.healthRecommendationComp.icons.windowAlt

Open your windows to bring clean, fresh air indoors

Get a monitor

Pollen

What is the pollen count in San Mateo County today?

Index

Pollen global icon

Low

Pollen tree icon

Tree

Low

25%
Pollen grass icon

Grass

Low

25%
Pollen weed icon

Weed

None

0%

Source:

wetter.com
Pollen forecast in San Mateo County

Health recommendations

common.healthRecommendationComp.icons.exerciseAlt

Enjoy outdoor activities

common.healthRecommendationComp.icons.windowAlt

Open your windows to bring clean, fresh air indoors

Get a monitor
air quality map

Real-time San Mateo County air pollution map

Pollen

What is the pollen count in San Mateo County today?

Index

Pollen global icon

Low

Pollen tree icon

Tree

Low

25%
Pollen grass icon

Grass

Low

25%
Pollen weed icon

Weed

None

0%

Source:

wetter.com
Pollen forecast in San Mateo County

Most polluted locations near San Mateo County

Worldwide AQI⁺ rankingArrow icon

Station ranking

Real-time AQI⁺ station ranking for stations in San Mateo County

#StationsAQI⁺ US
1
The national flag of USA

Durham Road

22

City ranking

Real-time USA AQI⁺ city ranking

#CitiesAQI⁺ US
1
The national flag of USA

Jurupa Valley, California

97

2
The national flag of USA

Avenal, California

92

3
The national flag of USA

Calexico, California

75

4
The national flag of USA

Holtville, California

69

5
The national flag of USA

El Paso, Texas

65

6
The national flag of USA

Hesperia, California

65

7
The national flag of USA

Houston, Texas

65

8
The national flag of USA

Indio, California

64

9
The national flag of USA

Oakland County, Michigan

63

10
The national flag of USA

Highland Park, Texas

62

History

Historic air quality graph for San Mateo County

22 AQI⁺ US
Good
11:00–12:00 Apr 17 Local time
AQI⁺ US

History

Historic air quality graph for San Mateo County

22 AQI⁺ US
Good
11:00–12:00 Apr 17 Local time
AQI⁺ US

Most polluted locations near San Mateo County

Worldwide AQI⁺ rankingArrow icon

Station ranking

Real-time AQI⁺ station ranking for stations in San Mateo County

#StationsAQI⁺ US
1
The national flag of USA

Durham Road

22

City ranking

Real-time USA AQI⁺ city ranking

#CitiesAQI⁺ US
1
The national flag of USA

Jurupa Valley, California

97

2
The national flag of USA

Avenal, California

92

3
The national flag of USA

Calexico, California

75

4
The national flag of USA

Holtville, California

69

5
The national flag of USA

El Paso, Texas

65

6
The national flag of USA

Hesperia, California

65

7
The national flag of USA

Houston, Texas

65

8
The national flag of USA

Indio, California

64

9
The national flag of USA

Oakland County, Michigan

63

10
The national flag of USA

Highland Park, Texas

62

Measure your own air quality

Get a monitor and contribute air quality data in your city.

Get a monitorHow to contribute
external link icon

Southeast Asia Air Quality Alert

Polluted skies over Cairo
external link icon

April 17, 2026: Cairo among top 10 most polluted cities in the world

Forest wrapped in a haze of smoke
external link icon

Wildfire Map Spotlight: Smoke Show Fire, Mississippi

Where is the cleanest air quality in San Mateo County?