Skip to content. | Skip to navigation

Personal tools


Current Ozone Levels for
San Antonio

The map below shows the latest one-hour ozone average for each monitoring site in parts per billion (ppb). To see all of today's measurements from a site, including the site name, click on the boxes.

The latest image available is for Monday March 30, 2015 20-21:00 CDT. 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 levels in San Antonio


Key to map symbols:

There is no current hourly ozone measurement at this site.
This value represents the current hourly ozone measurement at this site.

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 beginning 1/1/2013, 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.