AQI and Data Reports
Air quality index reports, airborne particulates, ozone, and meteorological and climatological data.
Air Quality Index (AQI)
The AQI scale is divided into the following categories:
Each National Ambient Air Quality Standards (NAAQS ) pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration where health effects for each pollutant begin to affect the general public. AQI ratings below 100 indicate no appreciable health risk. Additional information about the AQI and how it can be used is available from the EPA .
The AQI for ozone is based on the either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight. The AQIs for PM-10 and PM-2.5 are based on a 24-hour average sampled from midnight to midnight. The AQI for carbon monoxide is based on the peak eight-hour running average since midnight. The AQI for sulfur dioxide is based on the either the peak one-hour measurement since midnight OR the peak 24-hour average sampled since midnight. On most days the critical pollutant is ozone. Ozone one-hour average concentrations of 125 ppb or higher exceed the old NAAQS. The new NAAQS for ozone is based on eight-hour averages; an eight-hour average of 71 ppb exceeds the new NAAQS for ozone.
Ozone Reports
Ozone: The Facts
Sound
science and targeted regulations have greatly reduced ozone concentrations in Texas cities and across
the nation.
Voluntary Steps in
Helping Prevent Ozone
These simple tips will help you save money while protecting the Texas
environment.
Texas Cities' Compliance with Eight-Hour Ozone
Standard
Report for the fourth highest daily maximum eight-hour average ozone
concentrations in Texas Metropolitan areas.
Daily Maximum Eight-Hour Ozone Averages
Maximum
eight-hour ozone averages measured daily from yesterday back to 1997.
Four Highest Eight-Hour Ozone Concentrations
Calculated
from TCEQ monitoring site data available from today back to 1997.
Eight-Hour Ozone High Value Days
Averages that meet or
exceed 85 parts per billion ozone. Data available from one hour ago back to 1997.
Ozone Hourly Averages
Click a region to get a list of hourly averages.
PLEASE NOTE: This data has not been verified by 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.
High One-Hour Ozone Values
Measurements of high one-hour
ozone concentrations.
High Ozone Summary
Table that summarizes high one-hour
averages greater than 125 ppb and eight-hour ozone averages greater than 76 ppb in Texas
metropolitan areas.
Peak Daily One-Hour Ozone Averages
Maximum one-hour
ozone averages measured daily from yesterday back to 1996.
Airborne Particulates
Airborne particulates (example: dust, smoke, respiratory droplets containing viruses or bacteria) are also referred to as particulate matter or PM. Some are large enough to be seen with the naked eye, while others are so small they can only be seen with a microscope. These can come from natural sources like pollen, dust and wildfires; or from human activity, such as vehicle emissions and some industrial processes. These particles can be classified according to their size and their chemical composition, such as PM2.5 (particles 2.5 microns or less in size or PM10 (particles 10 microns or less in size).
View Airborne Particulates
tables
Tables summarizing the measured averages of fine particulates (particles 2.5
microns or less in size) and coarse particulates (particles 10 microns or less in size) from the
air in Texas metropolitan areas.
PM2.5 (particulate matter) are fine particles and are the smallest particles that are regulated. They consist of particles that are less than or equal to 2.5 micrometers in diameter. By comparison, the average diameter of human hair is 70 micrometers.
As they are so small, PM2.5 can easily travel through your respiratory tract into your lungs and your bloodstream, where they can cause various health problems. Health effects of high concentrations can include: irregular heartbeat, aggravated asthma, decreased lung function, respiratory problems, nonfatal heart attacks, and premature death in people with heart or lung disease. With knowledge of the level of air pollutants in your area, you are able to actively take steps to protect from the negative effects by limiting outdoor activity.
Current PM2.5 Hourly Averages by Region
TCEQ’s monitoring of
particulate matter 2.5 micrometers or less in diameter, measured at each region.
Four Highest
24-Hour PM2.5 Concentrations
Retrieve the four highest 24-hour
PM2.5 (local conditions) acceptable concentration averages from data collected at
TCEQ monitoring sites beginning January 1, 1998 through today.
Daily, Monthly, and Yearly Data Reports
Daily Hourly Data:
Hourly Data
Hourly averages for all the pollutants and meteorological conditions measured by the
TCEQ at each monitoring site.
Map
Use our interactive map to find hourly averaged data.
Monthly Hourly Data:
Monthly Data
Monthly summaries of the hourly averages for all the pollutants and meteorological
conditions measured by TCEQ at each monitoring site.
Map
Use our interactive map to find monthly averaged data.
Yearly Hourly Data:
Yearly Data
Yearly summaries of the hourly averages for all the pollutants and meteorological
conditions measured by TCEQ at each monitoring site.
Map
Use our interactive map to find yearly averaged data.
Hourly Air Pollution Data by Pollutant
Search for measurements of particular air pollutants found at TCEQ monitoring sites statewide.
Daily Summary Report By Site
A daily summary of hourly data collected at TCEQ's (and other select monitoring entities)
continuous ambient monitoring stations.
Monthly Summary Report By Site
A monthly summary of hourly data collected at TCEQ's (and other select monitoring entities)
continuous ambient monitoring stations.
Meteorological and Climatological
Current measurements of winds in the lower atmosphere, which help determine the movement of air pollution across Texas. Wind measurements from these profilers are used to determine the transport of air pollution and to help validate model-generated wind fields used for air quality modeling.
These wind plots are currently unavailable due to technical issues and will be restored as soon as resolved
La Porte Current Wind Plot
Dallas-Fort Worth, Cleburne Airport Current Wind Plot
How It Works
The radar profilers transmit radio wave pulses into the atmosphere and then record the resulting backscattered radio waves to measure winds in the range from 137 meters (449 feet) to 3,601 meters (11,814 feet) above ground level.
Real-time wind data plots are generated every 30 minutes from the radar profilers and relayed to this Web site for display. The plots show the last 12 hours of wind profiles. The wind data are plotted in standard meteorological form, with a vector line indicating the wind direction and barbs indicating the wind speed. The barbs are plotted on the tail of the wind vector (the end where the wind is coming from). Each full barb indicates five meters per second of wind speed (about 10 knots or 12 miles per hour) and a half-barb indicates 2.5 meters per second (about five knots or six miles per hour). The wind plots are colorized for wind speed using the color scale shown on the right side of the plot.
National Oceanic and Atmospheric Administration (NOAA) Data
Data from TCEQ radar profilers are available from NOAA's Multi-Agency Profiler Graphical Data Displays .
Data from the EPA AIR DATA page
The AirData website gives you access to air quality data collected at outdoor monitors across the United States, Puerto Rico, and the U. S. Virgin Islands. The data comes primarily from the AQS (Air Quality System) database. You can choose from several ways of looking at the data:
- download data into a file (or view it on the screen)
- output the data into one of AirData’s standard reports
- create graphical displays using one of the visualization tools
- investigate monitor locations using an interactive map
AirData lets you display and download monitored hourly, daily, and annual concentration data, AQI data, and speciated particle pollution data.