Nitrogen Dioxide (NO2) - 1
Hour Standard
National Ambient Air Quality Standard – 100 parts per
billion (ppb) – Based on a 3-year average of 98th percentile values.
Nitrogen dioxide comes from vehicles, power plants, industrial
emissions and off-road sources such as constructions, lawn and gardening
equipment. All of these sources burn fossil fuels. People who live or work
near busy roadways can experience high exposures.
Air Quality Index (AQI): Nitrogen Dioxide
(NO2)
0-50 |
Good |
No health impacts are expected when air quality is in this range. |
51-100* |
Moderate |
Individuals who are unusually sensitive to nitrogen dioxide should consider limiting prolonged outdoor exertion. |
101-150 |
Unhealthy for Sensitive Groups |
The following groups should limit prolonged outdoor exertion: - People with lung disease such as asthma
- Children and older adults
|
151-200 |
Unhealthy |
The following groups should avoid prolonged outdoor exertion: - People with lung disease such as asthma
- Children and older adults
Everyone else should limit prolonged outdoor exertion. |
201-300 |
Very Unhealthy |
The following groups should avoid all outdoor exertion: - People with lung disease such as asthma
- Children and older adults
Everyone else should limit outdoor exertion. |
*An AQI of 100 for nitrogen dioxide corresponds to a level of
100 ppb (averaged over 1 hour). |
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