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Current Nitrogen Dioxide 1-Hour Levels

The map below shows the current highest nitrogen dioxide 1-hour levels measured in parts per billion (ppb) for each of the metropolitan or other areas across Indiana where nitrogen dioxide is measured by the IDEM. More detailed maps showing the current 1-hour nitrogen dioxide levels measured at each site in a particular area are available by clicking on the boxes on the map. These levels are based on data measured at the IDEM's continuous air monitoring stations and may include data from local governments and private monitoring networks.

The latest imagery available is for Wednesday September 23, 2020 04-05:00 EDT.

Key to Nitrogen Dioxide Highlight Colors:

Nitrogen Dioxide levels have been mapped to colors based on the national one-hour standard levels.
The table below shows the levels, color-coding, and suggested actions for the one-hour standard.

Nitrogen Dioxide levels in this range are projected to be healthy based on the national one-hour standard for Nitrogen Dioxide.
  • No health impacts are expected when levels are within this range.
  • No special actions are required when levels are within this range.

PLEASE NOTE: This data has not been verified by the IDEM and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from IDEM ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.