Today's Ozone Forecasts - Texas Commission on Environmental Quality

Site Navigation

	Cleanups, Remediation
	Emergency Response
	Licensing
	Permits, Registrations
	Preventing Pollution
	Recycling
	Reporting
	Rules
	Data
	Maps

	About Us
	Contact Us

Have you had contact with the TCEQ lately? Complete our Customer Satisfaction Survey.

Air Quality

Questions or Comments:
monops@tceq.texas.gov

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 12, 2012. These ozone measurements are in parts per billion (ppb).

The latest available Ozone Forecast is for February 11, 2012.


Metropolitan Area	Historical Ozone Forecast* for February 12, 2012	January , as of 7:11 am CST
		Peak Ozone Concentrations		Ozone AQI Rating
		One-Hour	Eight-Hour	Ozone AQI Rating
Houston-Galveston-Brazoria ¹	Begins 03/01/2012	37 ppb	††	**
Beaumont-Port Arthur	Begins 05/01/2012	42 ppb	††	**
Dallas-Fort Worth	Begins 05/01/2012	28 ppb	††	**
Tyler-Longview-Marshall	Begins 05/01/2012	27 ppb	††	**
Austin	Begins 04/01/2012	27 ppb	††	**
San Antonio	Begins 04/01/2012	29 ppb	††	**
Corpus Christi	Begins 04/01/2012	36 ppb	††	**
Victoria	Begins 05/01/2012	28 ppb	††	**
El Paso-Juarez ¹	Begins 05/01/2012	37 ppb	††	**
* 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 not enough one-hour samples available to create a valid eight-hour sample for this metropolitan area for February 12, 2012.
** There is no AQI associated with one-hour samples that are less than 0.125 ppm (125 ppb).

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

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 EPA Exit

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