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Historical Pollutant and Weather Data

Air pollution and meteorological data from the TCEQ, local Texas monitoring networks, and the EPA since 1972.

This page provides access to two sources of pollutant and weather data. The first source, the Texas Commission on Environmental Quality (TCEQ) and local monitoring networks, provides hourly pollutant and weather data from 1972 to 2006. Data from 2007 to the current year, please use Texas Air Monitoring Information System (TAMIS).

The second source, the U.S. Environmental Protection Agency (EPA), provides data summaries and hourly data collected since 1982 on numerous pollutants and meteorological parameters in Texas and other states.


Data from the TCEQ and Local Programs

Tips on Data Format and Retrieval

To maximize the usefulness of this data for scientific and engineering analyses, please read the Monitoring Operations Texas Historical Environmental Records ( MOTHER) User's Guide. The Site Information File ( siteinfo) is also available for your convenience.

All sites are identified by an AIRS number. Pollutant and collocated meteorological monitoring sites also are identified by the site name, county and Consolidated Metropolitan Statistical Area.

See the TCEQ's Internet Help page for information about decompressing data files.

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The Monitoring Division at the TCEQ collects a wide variety of air pollution and meteorological data using near-real-time continuous instruments, "semi-continuous instruments", and non-continuous samplers. Continuous instruments capture data at continuous five-minute resolution, and observations are "rolled up" to one-hour resolution for regulatory use. Semi-continuous instruments collect samples over same period - e.g., 40 minutes - then analyze the sample over a few minutes time to produce a value time-tagged to the start of the hour and treated as being representative of the entire 60 minute period. Non-continuous data are collected by allowing fine particulate matter to collect on filters over 24-hours, or by slowing drawing air into stainless-steel canisters over one, three, or 24-hours, or by slowing drawing air through a porous membrane that entrains pollutant compounds. Non-continuous samples are then analyzed in a laboratory and the data are available days to months later.

Data from the EPA AIRS

By selecting the particular pollutant, year, and state or other location you are interested in, you can query the AIRS pollutant database Exit TCEQ to generate the Annual Report Summary page. This page lists peak and average measurements in table format. Each monitor is identified by a number, and more than one row of information may be given for each monitor. If there are multiple entries for the same monitor, each provides measurement data at different intervals (1-hour, 8-hour, 24-hour, etc.). Data collected by quality assurance monitors is, at times, also listed.

The years listed on the Annual Report Summary page are hot links to the Hourly Raw Data page, from which you can retrieve data collected on one day or a range of days up to one month. You can download the data tables generated in a text file. Be sure to follow the "reload" instructions if you are doing multiple queries. Raw data are only available for the most recent five years. Annual summaries are available back to 1982.