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Current PM-2.5 (Local Conditions) Acceptable 1-Hour Levels

The map below shows the current highest PM-2.5 (Local Conditions) Acceptable 1-hour levels measured in micrograms per cubic meter (local conditions) (µg/m³ LC) for each of the metropolitan or other areas across United States where PM-2.5 (Local Conditions) Acceptable is measured by the TREX. More detailed maps showing the current 1-hour PM-2.5 (Local Conditions) Acceptable 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 TREX's continuous air monitoring stations and may include data from local governments and private monitoring networks.

The latest imagery available is for Sunday April 30, 2017 19-20:00 MDT.

Key to PM-2.5 (Local Conditions) Acceptable Highlight Colors:

The color-coding of the hourly PM-2.5 data is based on a 1-hour to 24-hour projection. This projection is based on statistics compiled over several years comparing the daily maximum 1-hour average to the midnight-to-midnight 24-hour average.
The table below shows the levels, color-coding, and suggested actions for both the 1-hour projection and the actual 24-hour standard.

Color Air Quality Rating 1-Hour
Average
(µg/m³)
24-Hour
Average
(µg/m³)
Actions to take
There is no measurement for this area or site.
Good 0 - 15.4 0 - 12
  • 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.