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Today Hourly 7 days 30 days Air Quality
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Hourly Weather | Today › Thursday, October 2, 2025
San Mateo, California
6 AM
Cloudy Weather
64°
Feels Like 64°
34
Humidity: 82%
Wind: 6 mph
UV Index: 0
7 AM
Cloudy Night
64°
Feels Like 63°
23
Humidity: 84%
Wind: 6 mph
UV Index: 0
8 AM
Cloudy Weather
63°
Feels Like 63°
2
Humidity: 87%
Wind: 6 mph
UV Index: 3
9 AM
Cloudy Weather
64°
Feels Like 64°
2
Humidity: 82%
Wind: 7 mph
UV Index: 14
10 AM
Cloudy Weather
66°
Feels Like 66°
2
Humidity: 79%
Wind: 7 mph
UV Index: 24
11 AM
Cloudy Weather
66°
Feels Like 70°
2
Humidity: 75%
Wind: 8 mph
UV Index: 37
12 PM
Cloudy Weather
68°
Feels Like 72°
2
Humidity: 71%
Wind: 9 mph
UV Index: 44
1 PM
Cloudy Weather
70°
Feels Like 72°
1
Humidity: 67%
Wind: 10 mph
UV Index: 47
2 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 64%
Wind: 12 mph
UV Index: 44
3 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 61%
Wind: 13 mph
UV Index: 37
4 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 62%
Wind: 13 mph
UV Index: 26
5 PM
Cloudy Weather
70°
Feels Like 66°
0
Humidity: 65%
Wind: 13 mph
UV Index: 17
6 PM
Cloudy Weather
68°
Feels Like 64°
0
Humidity: 67%
Wind: 13 mph
UV Index: 7
7 PM
Cloudy Night
66°
Feels Like 63°
0
Humidity: 72%
Wind: 12 mph
UV Index: 0
8 PM
Cloudy Night
64°
Feels Like 61°
0
Humidity: 76%
Wind: 10 mph
UV Index: 0
9 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 78%
Wind: 10 mph
UV Index: 0
10 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 79%
Wind: 10 mph
UV Index: 0
11 PM
Cloudy Night
63°
Feels Like 59°
0
Humidity: 79%
Wind: 9 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

6 AM
37 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 6.23 µg/m³
  • PM10: 8.07 µg/m³
  • O₃: 24.26 ppb
  • NO₂: 4.80 ppb
  • SO₂: 1.00 ppb
  • CO: 122.32 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

7 AM
37 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 5.52 µg/m³
  • PM10: 6.83 µg/m³
  • O₃: 23.95 ppb
  • NO₂: 5.18 ppb
  • SO₂: 1.09 ppb
  • CO: 123.36 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

8 AM
38 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 5.83 µg/m³
  • PM10: 6.97 µg/m³
  • O₃: 23.63 ppb
  • NO₂: 5.55 ppb
  • SO₂: 1.19 ppb
  • CO: 124.39 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

9 AM
38 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 6.30 µg/m³
  • PM10: 7.44 µg/m³
  • O₃: 24.79 ppb
  • NO₂: 5.45 ppb
  • SO₂: 1.23 ppb
  • CO: 126.29 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

10 AM
39 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 6.35 µg/m³
  • PM10: 7.58 µg/m³
  • O₃: 25.95 ppb
  • NO₂: 5.35 ppb
  • SO₂: 1.28 ppb
  • CO: 128.19 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

11 AM
39 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 6.41 µg/m³
  • PM10: 7.92 µg/m³
  • O₃: 27.11 ppb
  • NO₂: 5.25 ppb
  • SO₂: 1.33 ppb
  • CO: 130.10 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

12 PM
40 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 6.71 µg/m³
  • PM10: 8.39 µg/m³
  • O₃: 29.26 ppb
  • NO₂: 4.63 ppb
  • SO₂: 1.25 ppb
  • CO: 127.14 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

1 PM
40 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 7.01 µg/m³
  • PM10: 8.89 µg/m³
  • O₃: 31.41 ppb
  • NO₂: 4.00 ppb
  • SO₂: 1.16 ppb
  • CO: 124.18 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

2 PM
41 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 7.24 µg/m³
  • PM10: 9.36 µg/m³
  • O₃: 33.56 ppb
  • NO₂: 3.38 ppb
  • SO₂: 1.08 ppb
  • CO: 121.22 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

3 PM
42 AQI
Good air quality Dominant pollutant: pm25
Details

Pollutant Concentrations:

  • PM2.5: 7.49 µg/m³
  • PM10: 9.82 µg/m³
  • O₃: 33.36 ppb
  • NO₂: 3.60 ppb
  • SO₂: 1.04 ppb
  • CO: 121.63 ppb

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors

Current Real-Time Air Quality Report