Hourly Weather | Today Wednesday, March 18, 2026
Ann Arbor, Michigan
9 AM
Cloudy Weather
19°
Feels Like 12°
7
Frost Risk: 99%
Humidity: 61%
UV Index: 2
Wind: 9 mph
10 AM
Cloudy Weather
23°
Feels Like 14°
7
Humidity: 57%
UV Index: 2
Wind: 10 mph
11 AM
Cloudy Weather
27°
Feels Like 16°
7
Humidity: 53%
UV Index: 2
Wind: 12 mph
12 PM
Cloudy Weather
28°
Feels Like 18°
7
Humidity: 51%
UV Index: 2
Wind: 14 mph
1 PM
Cloudy Weather
30°
Feels Like 18°
10
Humidity: 52%
UV Index: 2
Wind: 14 mph
2 PM
Snowy Weather
30°
Feels Like 18°
45
Humidity: 54%
UV Index: 1
Wind: 15 mph
3 PM
Snowy Weather
32°
Feels Like 19°
47
Humidity: 56%
UV Index: 1
Wind: 15 mph
4 PM
Cloudy Weather
34°
Feels Like 21°
43
Humidity: 59%
UV Index: 1
Wind: 15 mph
5 PM
Cloudy Weather
34°
Feels Like 21°
19
Humidity: 64%
UV Index: 0
Wind: 14 mph
6 PM
Cloudy Weather
36°
Feels Like 25°
19
Humidity: 66%
UV Index: 0
Wind: 13 mph
7 PM
Cloudy Weather
34°
Feels Like 25°
17
Humidity: 75%
UV Index: 0
Wind: 10 mph
8 PM
Cloudy Weather
34°
Feels Like 25°
14
Humidity: 80%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Weather
32°
Feels Like 25°
14
Humidity: 84%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Weather
30°
Feels Like 25°
14
Humidity: 87%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Weather
30°
Feels Like 27°
14
Humidity: 88%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 AM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.54 µg/m³
  • PM10: 2.31 µg/m³
  • O3: 0.047 ppm
  • NO2: 1.6 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 AM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.38 µg/m³
  • PM10: 1.91 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 AM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.42 µg/m³
  • PM10: 1.85 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

12 PM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 2 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.3 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.96 µg/m³
  • PM10: 2.31 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

2 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.37 µg/m³
  • PM10: 2.71 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

3 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.84 µg/m³
  • PM10: 3.25 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.3 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.22 µg/m³
  • PM10: 3.78 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.4 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.45 µg/m³
  • PM10: 4.17 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.66 µg/m³
  • PM10: 4.58 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 4.87 µg/m³
  • O3: 0.051 ppm
  • NO2: 3.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.83 µg/m³
  • PM10: 5.19 µg/m³
  • O3: 0.050 ppm
  • NO2: 3.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.01 µg/m³
  • PM10: 5.59 µg/m³
  • O3: 0.049 ppm
  • NO2: 3.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.38 µg/m³
  • PM10: 6.17 µg/m³
  • O3: 0.048 ppm
  • NO2: 3.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.95 µg/m³
  • PM10: 6.98 µg/m³
  • O3: 0.047 ppm
  • NO2: 3.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.16 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.