Hourly Weather | Today Wednesday, March 18, 2026
Knoxville, Tennessee
8 AM
Cloudy Weather
27°
Feels Like 27°
35
Humidity: 74%
UV Index: 0
Wind: 5 mph
9 AM
Cloudy Weather
28°
Feels Like 27°
38
Humidity: 67%
UV Index: 1
Wind: 5 mph
10 AM
Rainy Weather
32°
Feels Like 28°
42
Humidity: 52%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
37°
Feels Like 36°
19
Humidity: 42%
UV Index: 2
Wind: 7 mph
12 PM
Cloudy Weather
39°
Feels Like 39°
15
Humidity: 38%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
43°
Feels Like 43°
19
Humidity: 36%
UV Index: 2
Wind: 7 mph
2 PM
Cloudy Weather
45°
Feels Like 43°
38
Humidity: 35%
UV Index: 2
Wind: 7 mph
3 PM
Rainy Weather
46°
Feels Like 43°
42
Humidity: 34%
UV Index: 1
Wind: 8 mph
4 PM
Cloudy Weather
48°
Feels Like 46°
38
Humidity: 34%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
50°
Feels Like 48°
34
Humidity: 34%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
48°
Feels Like 46°
34
Humidity: 37%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
48°
Feels Like 45°
22
Humidity: 42%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
45°
Feels Like 45°
0
Humidity: 49%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
43°
Feels Like 41°
0
Humidity: 54%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
39°
Feels Like 39°
0
Humidity: 60%
UV Index: 0
Wind: 5 mph
11 PM
Night
37°
Feels Like 36°
0
Humidity: 66%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 AM
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.81 µg/m³
  • PM10: 22.63 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.85 µg/m³
  • PM10: 22.32 µg/m³
  • O3: 0.038 ppm
  • NO2: 3.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.77 µg/m³
  • PM10: 21.79 µg/m³
  • O3: 0.038 ppm
  • NO2: 4.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.75 µg/m³
  • PM10: 21.74 µg/m³
  • O3: 0.038 ppm
  • NO2: 4.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.95 µg/m³
  • PM10: 21.46 µg/m³
  • O3: 0.039 ppm
  • NO2: 3.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.29 µg/m³
  • PM10: 19.79 µg/m³
  • O3: 0.040 ppm
  • NO2: 2.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.79 µg/m³
  • PM10: 16.66 µg/m³
  • O3: 0.043 ppm
  • NO2: 2.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

3 PM
53 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.28 µg/m³
  • PM10: 9.74 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.3 ppb
  • SO2: 1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

4 PM
59 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.23 µg/m³
  • PM10: 8.81 µg/m³
  • O3: 0.057 ppm
  • NO2: 1.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

5 PM
58 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.51 µg/m³
  • PM10: 9.07 µg/m³
  • O3: 0.057 ppm
  • NO2: 1.4 ppb
  • SO2: 1.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

6 PM
52 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.61 µg/m³
  • PM10: 9.66 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.9 ppb
  • SO2: 1.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.67 µg/m³
  • PM10: 10.77 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.8 ppb
  • SO2: 1.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.73 µg/m³
  • PM10: 11.83 µg/m³
  • O3: 0.049 ppm
  • NO2: 3.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.02 µg/m³
  • PM10: 13.21 µg/m³
  • O3: 0.046 ppm
  • NO2: 3.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.66 µg/m³
  • PM10: 15.15 µg/m³
  • O3: 0.044 ppm
  • NO2: 4.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.64 µg/m³
  • PM10: 17.18 µg/m³
  • O3: 0.042 ppm
  • NO2: 4.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.16 ppm

Health Recommendations:

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