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Today's Ozone Forecasts

Air Quality Index

This table also lists the current peak one-hour and eight-hour concentrations and the corresponding Air Quality Index (AQI) rating for ozone for February 13, 2012. These ozone measurements are in parts per billion (ppb). The forecast is updated by 3:00 p.m. each day.

The following Ozone Forecast was updated at 3:00 pm CST on February 12, 2012.

         
Metropolitan AreaOzone Forecast* for
February 13, 2012
February 13, 2012
Peak Ozone ConcentrationsOzone
AQI Rating
One-HourEight-Hour
Houston-Galveston-Brazoria ¹Season Begins 03/01/2012††
Beaumont-Port Arthur Season Begins 05/01/2012††
Dallas-Fort Worth Season Begins 05/01/2012††
Tyler-Longview-Marshall Season Begins 05/01/2012††
Austin Season Begins 04/01/2012††
San Antonio Season Begins 04/01/2012††
Corpus Christi Season Begins 04/01/2012††
Victoria Season Begins 05/01/2012††
El Paso-Juarez ¹Season Begins 05/01/2012††
* Yes - Ozone is forecast to reach the target level.
   No - Ozone is not forecast to reach the target level.
See table below for terminology and target levels.
† There are no one-hour samples available for this metropolitan area for February 13, 2012.
†† There are not enough one-hour samples available to create a valid eight-hour sample for this metropolitan area for February 13, 2012.
‡ There is not enough data available to calculate a AQI for this metropolitan area for February 13, 2012.
¹ These metropolitan areas have other, non-TCEQ operated monitors that contribute to the overall forecast assessment of the area. Data from these sites is not included in this table.
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.

Ozone Forecast Terminology and Targets

    Metropolitan AreaOzone Forecast
    Terminology
    Ozone
    Target
    Level
    (ppb)
    Ozone
    Averaging
    Period
    Houston-Galveston-BrazoriaOzone Watch768-hour
    Beaumont-Port ArthurOzone Action Day768-hour
    Dallas-Fort WorthAir Pollution Watch-Orange768-hour
    Air Pollution Watch-Red968-hour
    Air Pollution Watch-Purple1168-hour
    Tyler-Longview-MarshallOzone Action Day768-hour
    AustinAir Pollution Watch-Orange768-hour
    Air Pollution Watch-Red968-hour
    Air Pollution Watch-Purple1168-hour
    San AntonioAir Quality Health Alert768-hour
    Corpus ChristiOzone Action Day768-hour
    VictoriaOzone Action Day768-hour
    El Paso-JuarezOzone Action Day768-hour

Interpreting the AQI

Air Quality Index

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 EPAExit.

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
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 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.