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Current Ozone 1-Hour Levels for San Antonio Metropolitan Area

The map below shows the latest 1-hour ozone average for each monitoring site in the San Antonio Metropolitan Area measured in parts per billion (ppb). The background color in each box represents the relative quality of the air based on the level of ozone that is being measured at each site. To see all of today's measurements from a site click on it's box.

The latest imagery available is for Tuesday December 18, 2018 16-17:00 CST.

Sites outside the San Antonio Metropolitan Area will appear dimmer than sites within the area. You can still select these sites to see data collected at them.

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.