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Pollutants

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).