Skip to content. | Skip to navigation
Use the selection boxes below to customize this report. You may select a different year, a different sorting order, or a different report format. Click on the Generate Report button once you have made your selections.
|2017 Sorted by Maximum Value|
|Location||Region||CAMS||AQS||Date||Time||Value||POC||No values meet or exceed 71 ppb for 2017|
|No sites report 8-hour ozone concentrations meeting or exceeding 71 parts per billion for 2017.|
|POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.|
Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.
Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.
The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.
|AQI Breakpoint Definitions|
|AQI Range||1hr Ozone
|0 - 50||Not Defined||0 - 0.054|
|51 - 100||Not Defined||0.055 - 0.070|
|101 - 150||0.125 - 0.164||0.071 - 0.085|
|151 - 200||0.165 - 0.204||0.086 - 0.105|
|201 - 300||0.205 - 0.404||0.106 - 0.200|
|301 - 400||0.405 - 0.504||Not Defined|
|401 - 500||Not Defined||Not Defined|
|500+||Not Defined||Not Defined|
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.