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AutoGC Data by Year by Site by Parameter

Use this form to retrieve hourly data collected at TCEQ Automated Gas Chromatograph (AutoGC) monitoring stations. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly.

This web page provides the most current hourly averaged data available. Our convention for time-tagging data is the beginning of each hour. For example, values shown for the noon hour are based on measurements taken from noon to 1:00 p.m. The noon average will not be calculated until after 1:00 p.m. The noon average will be then be available on our external server after 1:30 p.m. This results in an apparent one hour time lag in the data. We also present our data in Local Standard Time for each measuring site regardless of Daylight Savings Time Observance. For most of Texas this is Central Standard Time (sites in El Paso will be in Mountain Standard Time). During Daylight Savings, this introduces another apparent one hour time lag in the data.

Select a Year:
Select a Site: View hourly measurements for any compounds measured at any AutoGC site. Select the site you are interested in from the list below. The compound you select below will be shown at the selected monitoring site (if that site measures the parameter you select). Please note that not all parameters are measured at all sites.
      Measured in: ppb-Volume   ppb-Carbon
    Air Monitoring Comparison Value Highlights:  Odor   Short-Term Vegetation   Short-Term Health   Long-Term Vegetation   Long-Term Health   (if defined for a particular parameter)
    Report Format:  Tabular (webified)   Comma-delimited
    Decimals to Report:  

Once you have made your selections above, click on the Generate Report button.

You may use the controls below to select which parameter and statistics will be included in the report. If you have cookies enabled on your browser, these selections will be "remembered" from session to session.

    Ethane [P] *2-Methyl-1-Pentene [P] n-Propylbenzene [BP] *
    Ethylene [P] *1-Hexene [P] m-Ethyltoluene [BP]
    Propane [P] *n-Hexane [BP] *p-Ethyltoluene [BP]
    Propylene [P] *t-2-Hexene [BP] 1,3,5-Trimethylbenzene [BP] *
    Isobutane [P] *c-2-Hexene [BP] o-ethyltoluene [BP]
    n-Butane [P] *Methylcyclopentane [BP] *1,2,4-Trimethylbenzene [BP] *
    Acetylene [P] *2,4-Dimethylpentane [BP] *n-Decane [BP] *
    t-2-Butene [P] *Benzene [BP] *1,2,3-Trimethylbenzene [BP] *
    1-Butene [P] *Cyclohexane [BP] *m-Diethylbenzene [BP]
    Isobutene [P] 2-Methylhexane [BP] *p-Diethylbenzene [BP]
    c-2-Butene [P] *2,3-Dimethylpentane [BP] *n-Undecane [BP]
    Cyclopentane [P] *3-Methylhexane [BP] *a-Pinene [BP]
    Isopentane [P] *2,2,4-Trimethylpentane [BP] *b-Pinene [BP]
    n-Pentane [P] *n-Heptane [BP] *Cyclopentene [P]
    1,3-Butadiene [P] *Methylcyclohexane [BP] *3-Methyl-1-Butene [P]
    3-Methyl-1-Butene+Cyclopentene [P] 2,3,4-Trimethylpentane [BP] *Wind Speed
    t-2-Pentene [P] *Toluene [BP] *Resultant Wind Speed
    2-Methyl-2-Butene [P] 2-Methylheptane [BP] *Resultant Wind Direction
    1-Pentene [P] *3-Methylheptane [BP] *
    c-2-Pentene [P] *n-Octane [BP] *
    2,2-Dimethylbutane [P] *Ethyl Benzene [BP] *
    2,3-Dimethylbutane [P] p-Xylene + m-Xylene [BP] *
    2-Methylpentane [P] Styrene [BP] *
    3-Methylpentane [P] o-Xylene [BP] *
    Isoprene [P] *n-Nonane [BP] *
    4-Methyl-1-Pentene [P] Isopropyl Benzene - Cumene [BP] *
    * - Target Compounds effective April 1998

    Select which statistics to include:
    Maximum ValueDailyYearly
    Second Highest ValueDailyYearly
    Minimum ValueDailyYearly
    Average ValueDailyYearly
    Standard DeviationDailyYearly
    Data RecoveryDailyYearly