Hourly Weather | Today Wednesday, May 20, 2026
Flagstaff, Arizona
4 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 10%
UV Index: 4
Wind: 13 mph
5 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 11%
UV Index: 2
Wind: 13 mph
6 PM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 12%
UV Index: 1
Wind: 12 mph
7 PM
Sunny Weather
63°
Feels Like 59°
0
Humidity: 17%
UV Index: 0
Wind: 9 mph
8 PM
Night
57°
Feels Like 54°
0
Humidity: 21%
UV Index: 0
Wind: 8 mph
9 PM
Night
54°
Feels Like 50°
0
Humidity: 24%
UV Index: 0
Wind: 8 mph
10 PM
Night
48°
Feels Like 46°
0
Humidity: 27%
UV Index: 0
Wind: 7 mph
11 PM
Night
46°
Feels Like 43°
0
Humidity: 29%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 PM
102 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.74 µg/m³
  • PM10: 21.32 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

5 PM
102 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 19.05 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

6 PM
103 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.66 µg/m³
  • PM10: 16.91 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

7 PM
100 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.39 µg/m³
  • PM10: 15.58 µg/m³
  • O3: 0.070 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
91 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.3 µg/m³
  • PM10: 15.01 µg/m³
  • O3: 0.067 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM
83 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.29 µg/m³
  • PM10: 15.02 µg/m³
  • O3: 0.065 ppm
  • NO2: 2.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
73 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.4 µg/m³
  • PM10: 15.52 µg/m³
  • O3: 0.061 ppm
  • NO2: 2.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
62 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.62 µg/m³
  • PM10: 16.39 µg/m³
  • O3: 0.058 ppm
  • NO2: 2.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.