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Current Ozone 8-Hour Levels

The map below shows the current highest ozone 8-hour levels measured in parts per billion (ppb) for each of the metropolitan or other areas across United States where ozone is measured by the TREX. More detailed maps showing the current 8-hour ozone levels measured at each site in a particular area are available by clicking on the colored boxes below. These levels are based on data measured at the continuous air monitoring stations and may include data from local governments and private monitoring networks.

The latest image available is for Thursday November 27, 2014 19:00 MST. If the image below is older than this, you will need to force your browser to reload this page by clicking on the browser "Reload" or "Refresh" button.

Map showing current Ozone 8-hour levels in United States.

The TREX has not verified this data and it may change. This is the most current data, but it is not official until it has been certified by our technical staff.

Key to Ozone Highlight Colors:

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

There is no current measurement for this area or site.
Ozone levels in this range are projected to be healthy based on the national eight-hour standard for Ozone.
  • No health impacts are expected when levels are within this range.
  • No health impacts are expected when levels are within this range.

PLEASE NOTE: This data has not been verified by the TREX 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 TREX 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.