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Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.

Select a date:	Time Format:	Select a Parameter:
January February March April May June July August September October November December   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31   1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025	12 Hour (AM/PM)24 Hour	PM Coarse Cabinet Temperature in degrees Fahrenheit Fuel Cell Amperage in amps Fuel Cell Voltage DC in volts Fuel Cell Power in kilowatts Fuel Cell Efficiency in percent Nephelometer B sp - 450 nanometers in beta scatter 3-Methyl-1-Butene And Cyclopentene in parts per billion 2-Methylhexane And 2-3-Dimethylpentane in parts per billion Silane in parts per billion H2S Voltage in volts SO2 Voltage in volts H2S Max in parts per million H2S Max Time in HHMMSS.SS H2S Over Range in no units SO2 Max in parts per million SO2 Max Time in HHMMSS.SS SO2 Over Range in no units Date of GPS Data Collection in DDMMYY Time of GPS Data Collection in HHMMSS.SS Course Over Ground Variation in degrees compass Course Over Ground in degrees compass Speed Over Ground in knots Differential Reference Station ID in no units Age of Differential GPS Data in elapsed time Geoidal Separation in meters GPS Antenna Altitude in meters Horizontal Dilution of Precision in percent Number of Satellites in Use in no units GPS Quality Indicator in no units NOz in parts per billion Nephelometer B sp - 520 nanometers (green light band) in inverse megameters Nephelometer Visibility SVR-IMPROVE (km) in kilometers (visibility) Nephelometer Visibility SVR-IMPROVE (miles) in miles (visibility) Nephelometer Fine Particulate Mass in no units Latitude in no units Longitude in no units Extinction Coefficient in inverse miles Day/Night Flag in no units Present Weather in no units Present Weather Obscuration in no units Total Suspended Particulate (Lcl) in micrograms per cubic meter (local conditions) bsp Nephelometer in inverse megameters Nephelometer FPM in inverse megameters Latitude in no units Longitude in no units Carbon Monoxide in parts per million Carbon Disulfide in parts per billion Water in parts per billion Hydrochloric Acid in parts per billion Nitric Acid in parts per billion Sulfur Dioxide in parts per billion Hydrogen Sulfide in parts per billion NOy in parts per billion Nitric Oxide in parts per billion Nitrogen Dioxide in parts per billion Oxides of Nitrogen in parts per billion Ammonia in parts per billion Nitrous Oxide in parts per billion NOz in parts per billion Sum of PAMS Target Compounds in parts per billion Total Non-Methane Organic Compounds in parts per billion carbon N-Dodecane in parts per billion Cis/Trans-2-Butene in parts per billion Ethane in parts per billion Ethylene in parts per billion Propane in parts per billion Propylene in parts per billion Acetylene in parts per billion N-Butane in parts per billion Iso-Butane in parts per billion Trans-2-Butene in parts per billion Cis-2-Butene in parts per billion 1,3 Butadiene in parts per billion n-Pentane in parts per billion Iso-Pentane in parts per billion 1-Pentene in parts per billion Trans-2-Pentene in parts per billion Cis-2-Pentene in parts per billion 2-Methyl-2-Butene in parts per billion 3-Methylpentane in parts per billion n-Hexane in parts per billion N-Heptane in parts per billion N-Octane in parts per billion 4-Methyl-1-Pentene in parts per billion N-Nonane in parts per billion N-Decane in parts per billion Cyclopentane in parts per billion Isoprene in parts per billion 2,2-Dimethylbutane in parts per billion 2-Methyl-1-Pentene in parts per billion 2,4-Dimethylpentane in parts per billion Cyclohexane in parts per billion 3-Methylhexane in parts per billion 2,2,4-Trimethylpentane in parts per billion 2,3,4-Trimethylpentane in parts per billion 3-Methylheptane in parts per billion Methylcyclohexane in parts per billion Methylcyclopentane in parts per billion 2-Methylhexane in parts per billion Iso-Butene in parts per billion 1-Butene in parts per billion 3-Methyl-1-Butene in parts per billion 2,3-Dimethylbutane in parts per billion 2-Methylpentane in parts per billion Trans-2-Hexene in parts per billion Cis-2-Hexene in parts per billion 2,3-Dimthylpentane in parts per billion Methanol in parts per billion n-Butyl Alcohol in parts per billion Methyl-Tert-Butyl Ether in parts per billion Ethyl Acrylate in parts per billion Formaldehyde in parts per billion Acetaldehyde in parts per billion Ethylene Oxide in parts per billion Propylene Oxide in parts per billion Acrylonitrile in parts per billion Dichloromethane in parts per billion Chloroform in parts per billion Dichloroethane 1,2 (EDC) in parts per billion N-Undecane in parts per billion 2-Methylheptane in parts per billion Ozone in parts per billion M/P Xylene in parts per billion Benzene in parts per billion Toluene in parts per billion Ethyl Benzene in parts per billion O-Xylene in parts per billion 1,3,5-Trimethylbenzene in parts per billion 1,2,4-Trimethylbenzene in parts per billion N-Propylbenzene in parts per billion Isopropylbenzene in parts per billion O-Ethyltoluene in parts per billion M-Ethyltoluene in parts per billion P-Ethyltoluene in parts per billion M-Diethylbenzene in parts per billion P-Diethylbenzene in parts per billion Styrene in parts per billion 1,2,3-Trimethylbenzene in parts per billion Naphtalene in parts per billion Wind Speed in miles per hour Wind Direction in degrees compass Resultant Wind Speed in miles per hour Resultant Wind Direction in degrees compass Maximum Wind Gust in miles per hour Standard Deviation of Horizontal Wind Direction Outdoor Temperature in degrees Fahrenheit Dew Point Temperature in degrees Fahrenheit Delta Temperature in degrees Fahrenheit Relative Humidity in percent Visibility in miles (visibility) Solar Radiation in langleys per minute Ultraviolet Radiation in langleys per minute Net Radiation in langleys per minute Barometric Pressure in millibars Precipitation in inches (rainfall) PM-10 (Standard Conditions) in ug/cu meter (25 c) PM Coarse PM-10 in no units PM-10 (Local Conditions) in micrograms per cubic meter (local conditions) PM10-2.5 Local Conditions in micrograms per cubic meter (local conditions) PM-2.5 (Local Conditions) in micrograms per cubic meter (local conditions) OCX Carbon PM2.5 LC in no units Organic Carbon PM2.5 LC in no units Nitrate PM2.5 LC in no units Elemental Carbon PM2.5 LC in micrograms per cubic meter (local conditions) R&P PM-2.5 NO3 in parts per billion Total Carbon PM2.5 LC in micrograms per cubic meter (local conditions) Black Carbon PM2.5 in no units Optical EC PM2.5 LC TOT in micrograms per cubic meter (local conditions) Sulfate PM2.5 LC in no units PM-2.5 (Local Conditions) Acceptable in micrograms per cubic meter (local conditions) BC Test in no units FTIR Reflector number in no units
Highlight validated data (Validated data has been manually reviewed by a data validator)
Select a Region: All Active Regions Region 1 -- Amarillo Region 2 -- Lubbock Region 3 -- Abilene Region 4 -- DFW Region 5 -- Tyler Region 6 -- El Paso Region 7 -- Midland Region 8 -- San Angelo Region 9 -- Waco Region 10 -- Beaumont Region 11 -- Austin Region 12 -- Houston Region 13 -- San Antonio Region 14 -- Corpus Christi Region 15 -- Harlingen Region 16 -- Laredo

Ozone Hourly Averages for Tuesday, July 1, 2025. measured in parts per billion
Region	CAMS	Morning												Afternoon											CAMS	POC	Entity
		Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00
El Paso-Juarez - all times are in MST
	37	30	28	19	31	31	31	30	34	36	38	41	42	44	45	47	47	46	46	44	41	FEW	NA	NA	37	1 R MDL	TCEQ
	41	37	29	26	29	30	30	28	26	33	32	33	35	38	40	40	39	39	39	38	37	FEW	NA	NA	41	1 R MDL	TCEQ
	49	34	29	28	29	30	30	30	33	35	38	42	42	44	42	42	43	44	43	43	38	FEW	NA	NA	49	1 R MDL	TCEQ
	72	30	32	30	29	30	28	29	31	34	36	38	40	44	48	48	47	45	43	42	41	FEW	NA	NA	72	1 R MDL	TCEQ
	414	33	25	28	26	26	25	25	27	29	31	32	33	37	38	40	40	36	36	34	31	FEW	NA	NA	414	1 R MDL	TCEQ
	1021	35	31	36	35	36	37	37	QAS	QAS	QAS	QAS	41	43	48	49	48	50	47	46	43	FEW	NA	NA	1021	1 R MDL	TCEQ
		Maximum values for the day are bold within the table. Minimum values are bold italic.
		R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

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.