Washington Air Quality

Homefacts tracks the most recent local air monitoring and pollution testing results to create our overall Air Pollution Grade for Washington, Washington Dc. See how the air around your home compares.

Homefacts Overall Air Quality Grade - 1.5/10

What do these numbers mean?

Higher is better. Homefacts looks at the measuring stations across the country and compares the amounts of each specific pollutant. A higher number means it has fewer amounts of that pollutant. For example: If your city has a 9.0 for Ozone, it means that 90% of the stations around the country are measuring higher amounts than your local station.

Carbon Monoxide

View Carbon Monoxide Station Measurement Details

EPA Standard: 1 Hour Average: 35 | 8 Hour Average: 9 | Measurement Type: PPM (Parts Per Million)

# of 1 Hr Observations: 8649
EPA 1 Hr Standard Violations: 0
1 Hr 1st Max: 2.5
1 Hr 3rd Max: 2.4
# of 8 Hr Observations: 8705
EPA 8 Hr Std. Violations: 0
8 Hr 1st Max: 2
8 Hr 2nd Max: 1.9

Ozone

View Ozone Station Measurement Details

EPA Standard: 1 Hour Average: 0.12 | 8 Hour Average: 0.075 | Measurement Type: PPM (Parts Per Million)

# of 1 Hr Observations: 8628
EPA 1 Hr Standard Violations: 0
1 Hr 1st Max: 0.097
1 Hr 2nd Max: 0.095
1 Hr 3rd Max: 0.087
1 Hr 4th Max: 0.085
# of 8 Hr Observations: 8683
EPA 8 Hr Standard Violations: 2
8 Hr 1st Max: 0.085
8 Hr 2nd Max: 0.076
8 Hr 3rd Max: 0.074
8 Hr 4th Max: 0.071

PM 10

View PM 10 Station Measurement Details

EPA Standard: 24 Hour Average: 150 | Annual Mean 50 | Measurement Type: ug/m3 (Micrograms Per Cubic Meter

# of 24 Hr Observations: 62
24 Hr 1st Max: 60
24 Hr 3rd Max: 35
24 Hr Annual Mean: 17.04839
24 Hr 2nd Max: 41
24 Hr 4th Max: 33

PM 2.5

View PM 2.5 Station Measurement Details

EPA Standard: 24 Hour Average: 35 | Annual Mean 15 | Measurement Type: ug/m3 (Micrograms Per Cubic Meter

# of 24 Hr Observations: 117
24 Hr 1st Max: 40.9
24 Hr 3rd Max: 22.7
24 Hr Annual Mea: 10.16496
24 Hr 2nd Max: 25.2
24 Hr 4th Max: 20.6

Sulfur Dioxide

View Sulfur Dioxide Station Measurement Details

EPA Standard: 1 Hour Average: 75 | 24 Hour Average: 140 | Annual Mean: 0.03 | Measurement Type: PPM (Parts Per Million)

# of 1 Hr Observations: 8565
EPA 1 Hr Standards Violations: 0
1 Hr 1st Max: 58
1 Hr 2nd Max: 44
24 Hr Annual Mean: 4.55722
# of 24 Hr Observations: 360
EPA 24 Hr Standard Violations: 0
24 Hr 1st Max: 33
24 Hr 2nd Max: 17.3

Nitrogen DiOxide

View Nitrogen Di Oxide Station Measurement Details

EPA Standard: 1 Hour Average: 100 | Measurement Type: ug/m3 (Micrograms Per Cubic Meter)

EPA 1 Hr Standard Violations: 0
1 Hr Annual Mean: 30.16209
1 Hr 1st Max: 80
1 Hr 2nd Max: 72