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The map below shows the current highest ozone 1-hour levels measured in parts per billion (ppb) for each of the metropolitan or other areas across Texas where ozone is measured by the TCEQ. More detailed maps showing the current 1-hour ozone 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 TCEQ's continuous air monitoring stations and may include data from local governments and private monitoring networks.
The latest imagery available is for Sunday February 26, 2017 21-22:00 CST.
PLEASE NOTE: This data has not been verified by the TCEQ 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 TCEQ 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.
Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.