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 • 15 Followers • 18:00, Jun 05 Local time

27

US AQI⁺

Good

face expression based on aqi value

Main pollutant:

PM2.5

4.9 µg/m³

weather condition icon

14°

wind direction icon

15 km/h

weather humid icon

77 %

Hourly forecast

San Mateo County air quality index (AQI⁺) forecast

Now

27

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 259 degree

15

km/h

Humidity icon

77%

19:00

29

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 257 degree

15

km/h

Humidity icon

92%

20:00

31

Weather icon

90%

11°

IQAir AirVisual Air Quality Map Wind rotating 261 degree

15

km/h

Humidity icon

96%

21:00

32

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 265 degree

15

km/h

Humidity icon

97%

22:00

30

Weather icon

90%

11°

IQAir AirVisual Air Quality Map Wind rotating 267 degree

16

km/h

Humidity icon

97%

23:00

28

Weather icon

90%

11°

IQAir AirVisual Air Quality Map Wind rotating 267 degree

16

km/h

Humidity icon

98%

Sat

00:00

27

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 267 degree

17

km/h

Humidity icon

98%

01:00

26

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 270 degree

18

km/h

Humidity icon

98%

02:00

24

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 272 degree

19

km/h

Humidity icon

98%

03:00

26

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 276 degree

19

km/h

Humidity icon

98%

04:00

27

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 280 degree

18

km/h

Humidity icon

98%

05:00

29

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

18

km/h

Humidity icon

99%

06:00

28

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 275 degree

18

km/h

Humidity icon

99%

07:00

27

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 276 degree

19

km/h

Humidity icon

99%

08:00

27

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 278 degree

18

km/h

Humidity icon

99%

09:00

25

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

18

km/h

Humidity icon

99%

10:00

24

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 278 degree

17

km/h

Humidity icon

99%

11:00

23

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 276 degree

15

km/h

Humidity icon

99%

12:00

24

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 270 degree

16

km/h

Humidity icon

99%

13:00

25

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 271 degree

18

km/h

Humidity icon

99%

14:00

27

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 274 degree

21

km/h

Humidity icon

99%

15:00

27

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

21

km/h

Humidity icon

99%

16:00

27

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

22

km/h

Humidity icon

99%

17:00

28

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

21

km/h

Humidity icon

99%

18:00

27

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

20

km/h

Humidity icon

99%

19:00

26

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

19

km/h

Humidity icon

99%

20:00

26

Weather icon

90%

10°

IQAir AirVisual Air Quality Map Wind rotating 278 degree

18

km/h

Humidity icon

99%

21:00

27

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

17

km/h

Humidity icon

99%

22:00

28

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 281 degree

14

km/h

Humidity icon

99%

23:00

29

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

14

km/h

Humidity icon

99%

Sun

00:00

28

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 273 degree

12

km/h

Humidity icon

99%

01:00

27

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 263 degree

9

km/h

Humidity icon

99%

02:00

26

Weather icon

90%

9°

IQAir AirVisual Air Quality Map Wind rotating 265 degree

6

km/h

Humidity icon

99%

03:00

25

Weather icon

9°

IQAir AirVisual Air Quality Map Wind rotating 206 degree

1

km/h

Humidity icon

98%

04:00

24

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 34 degree

1

km/h

Humidity icon

71%

05:00

23

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 41 degree

2

km/h

Humidity icon

60%

06:00

23

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 35 degree

2

km/h

Humidity icon

55%

07:00

23

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 312 degree

3

km/h

Humidity icon

61%

08:00

24

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 31 degree

3

km/h

Humidity icon

76%

09:00

23

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 324 degree

3

km/h

Humidity icon

74%

10:00

22

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 306 degree

5

km/h

Humidity icon

75%

11:00

21

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 283 degree

8

km/h

Humidity icon

80%

12:00

21

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 266 degree

7

km/h

Humidity icon

73%

13:00

21

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 265 degree

9

km/h

Humidity icon

72%

14:00

21

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 268 degree

11

km/h

Humidity icon

73%

15:00

22

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 270 degree

13

km/h

Humidity icon

69%

16:00

23

Weather icon

90%

13°

IQAir AirVisual Air Quality Map Wind rotating 270 degree

15

km/h

Humidity icon

72%

17:00

24

Weather icon

90%

12°

IQAir AirVisual Air Quality Map Wind rotating 269 degree

16

km/h

Humidity icon

80%

18:00

23

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 283 degree

15

km/h

Humidity icon

59%

19:00

22

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 292 degree

17

km/h

Humidity icon

65%

20:00

21

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

11

km/h

Humidity icon

74%

21:00

17

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

11

km/h

Humidity icon

78%

22:00

13

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 281 degree

10

km/h

Humidity icon

80%

23:00

10

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 289 degree

11

km/h

Humidity icon

83%

Mon

00:00

10

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 288 degree

11

km/h

Humidity icon

85%

01:00

10

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 281 degree

10

km/h

Humidity icon

86%

02:00

10

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 284 degree

11

km/h

Humidity icon

87%

03:00

13

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 281 degree

10

km/h

Humidity icon

89%

04:00

16

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 277 degree

10

km/h

Humidity icon

90%

05:00

20

Weather icon

10°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

10

km/h

Humidity icon

90%

06:00

19

Weather icon

11°

IQAir AirVisual Air Quality Map Wind rotating 278 degree

9

km/h

Humidity icon

92%

07:00

19

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 282 degree

10

km/h

Humidity icon

90%

08:00

19

Weather icon

12°

IQAir AirVisual Air Quality Map Wind rotating 283 degree

10

km/h

Humidity icon

87%

09:00

16

Weather icon

13°

IQAir AirVisual Air Quality Map Wind rotating 279 degree

9

km/h

Humidity icon

85%

10:00

14

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 271 degree

8

km/h

Humidity icon

85%

11:00

12

Weather icon

14°

IQAir AirVisual Air Quality Map Wind rotating 260 degree

8

km/h

Humidity icon

86%

12:00

12

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 246 degree

8

km/h

Humidity icon

84%

13:00

13

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 243 degree

9

km/h

Humidity icon

81%

14:00

14

Weather icon

17°

IQAir AirVisual Air Quality Map Wind rotating 239 degree

10

km/h

Humidity icon

75%

15:00

15

Weather icon

16°

IQAir AirVisual Air Quality Map Wind rotating 237 degree

10

km/h

Humidity icon

78%

16:00

16

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 230 degree

9

km/h

Humidity icon

87%

17:00

18

Weather icon

15°

IQAir AirVisual Air Quality Map Wind rotating 231 degree

9

km/h

Humidity icon

88%

Daily forecast

|

San Mateo County air quality index (AQI⁺) forecast

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

Protect yourself from air pollution in San Mateo County

SHOP IQAIR PRODUCTS

Air Purifiers

Face Masks

Air Quality Monitors

Pollen

What is the pollen count in San Mateo County today?

Index

Pollen global icon

Moderate

Pollen tree icon

Tree

None

0%
Pollen grass icon

Grass

Moderate

50%
Pollen weed icon

Weed

None

0%

Source:

wetter.com
Pollen forecast in San Mateo County

Health recommendations

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

Moderate

Pollen tree icon

Tree

None

0%
Pollen grass icon

Grass

Moderate

50%
Pollen weed icon

Weed

None

0%

Source:

wetter.com
Pollen forecast in San Mateo County

Protect yourself from air pollution in San Mateo County

SHOP IQAIR PRODUCTS

Air Purifiers

Face Masks

Air Quality Monitors

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

Arlington Way

29

2
The national flag of USA

Alberta Glen

28

3
The national flag of USA

265 Old Spanish Trail

27

4
The national flag of USA

920 Bear Gulch Road

27

5
The national flag of USA

Cerrito Avenue

27

6
The national flag of USA

Alexander Avenue

26

7
The national flag of USA

Alpine Road

26

8
The national flag of USA

Dirt Alpine

26

9
The national flag of USA

480 Tunitas Creek Road

25

10
The national flag of USA

Bear Gulch Road

12

City ranking

Real-time USA AQI⁺ city ranking

#CitiesAQI⁺ US
1
The national flag of USA

Mariposa, California

89

2
The national flag of USA

Redlands, California

87

3
The national flag of USA

Crestline, California

82

4
The national flag of USA

Ozaukee, Wisconsin

81

5
The national flag of USA

Glendora, California

77

6
The national flag of USA

Catheys Valley, California

76

7
The national flag of USA

Santa Clarita, California

75

8
The national flag of USA

Altadena, California

74

9
The national flag of USA

New Haven, Connecticut

73

10
The national flag of USA

Avenal, California

72

History

Historic air quality graph for San Mateo County

27 AQI⁺ US
Good
17:00–18:00 Jun 05 Local time
AQI⁺ US

History

Historic air quality graph for San Mateo County

27 AQI⁺ US
Good
17:00–18:00 Jun 05 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

Arlington Way

29

2
The national flag of USA

Alberta Glen

28

3
The national flag of USA

265 Old Spanish Trail

27

4
The national flag of USA

920 Bear Gulch Road

27

5
The national flag of USA

Cerrito Avenue

27

6
The national flag of USA

Alexander Avenue

26

7
The national flag of USA

Alpine Road

26

8
The national flag of USA

Dirt Alpine

26

9
The national flag of USA

480 Tunitas Creek Road

25

10
The national flag of USA

Bear Gulch Road

12

City ranking

Real-time USA AQI⁺ city ranking

#CitiesAQI⁺ US
1
The national flag of USA

Mariposa, California

89

2
The national flag of USA

Redlands, California

87

3
The national flag of USA

Crestline, California

82

4
The national flag of USA

Ozaukee, Wisconsin

81

5
The national flag of USA

Glendora, California

77

6
The national flag of USA

Catheys Valley, California

76

7
The national flag of USA

Santa Clarita, California

75

8
The national flag of USA

Altadena, California

74

9
The national flag of USA

New Haven, Connecticut

73

10
The national flag of USA

Avenal, California

72

Measure your own air quality

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

Get a monitorHow to contribute
New york city skyline
external link icon

June 5, 2026 Air Quality Alert: Elevated ozone levels affect multiple U.S. states

external link icon

Heatwave Map Spotlight: South Asia

external link icon

Wildfire map spotlight: Santa Rosa Island Fire, California

Begin your journey for cleaner air #IQAir

IQAir InstagramVisit us
IQAir TwitterVisit us
IQAir TiktokVisit us
IQAir FacebookVisit us

Where is the cleanest air quality in San Mateo County?