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空気質データの提供元: the Texas Commission on Environmental Quality (TCEQ) (tceq.texas.gov) and Air Now - US EPA (airnow.gov)
Note that the measurements for PM2.5 (fine particulate matter), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: CPS Pecan Valley, San Antonio, Texas and the measurement for O3 (ozone) are taken from the station: USA:Texas/San Antonio/City Of Garden Ridge