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Today's Ozone Forecasts
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 Area | Ozone Forecast* for
February 13, 2012 | February 13, 2012 |
|---|
| Peak Ozone Concentrations | Ozone
AQI Rating |
|---|
| One-Hour | Eight-Hour |
|---|
| Houston-Galveston-Brazoria ¹ | Season 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 ¹ | Season 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 Area | Ozone Forecast
Terminology | Ozone
Target
Level
(ppb) | Ozone
Averaging
Period |
|---|
| Houston-Galveston-Brazoria | Ozone Watch | 76 | 8-hour | | Beaumont-Port Arthur | Ozone Action Day | 76 | 8-hour | | Dallas-Fort Worth | Air Pollution Watch-Orange | 76 | 8-hour | | Air Pollution Watch-Red | 96 | 8-hour | | Air Pollution Watch-Purple | 116 | 8-hour | | Tyler-Longview-Marshall | Ozone Action Day | 76 | 8-hour | | Austin | Air Pollution Watch-Orange | 76 | 8-hour | | Air Pollution Watch-Red | 96 | 8-hour | | Air Pollution Watch-Purple | 116 | 8-hour | | San Antonio | Air Quality Health Alert | 76 | 8-hour | | Corpus Christi | Ozone Action Day | 76 | 8-hour | | Victoria | Ozone Action Day | 76 | 8-hour | | El Paso-Juarez | Ozone Action Day | 76 | 8-hour |
Interpreting the AQI
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 .
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 |
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