Description: This United States Environmental Protection Agency (US EPA) feature layer represents interpolated contour surfaces based on updated hourly Air Quality Index (AQI) values for the most recent hour available. The interpolated surfaces are for Ozone (O3) and currently for the US only. The source of this feature layer is GRIB2 files located here.Please note, the values within the Gridcode field correlate to the following AQI Categories:1 = AQI Category: "Good"2 = AQI Category: "Moderate"3 = AQI Category: "Unhealthy for Sensitive Groups"4 = AQI Category: "Unhealthy"5 = AQI Category: "Very Unhealthy"6 = AQI Category: "Hazardous"Map and forecast data are collected using federal reference or equivalent monitoring techniques or techniques approved by the state, local or tribal monitoring agencies. To maintain "real-time" maps, the data are displayed after the end of each hour. Although preliminary data quality assessments are performed, the data in AirNow are not fully verified and validated through the quality assurance procedures monitoring organizations used to officially submit and certify data on the EPA Air Quality System (AQS).This data sharing, and centralization creates a one-stop source for real-time and forecast air quality data. The benefits include quality control, national reporting consistency, access to automated mapping methods, and data distribution to the public and other data systems. The U.S. Environmental Protection Agency, National Oceanic and Atmospheric Administration, National Park Service, tribal, state, and local agencies developed the AirNow system to provide the public with easy access to national air quality information. State and local agencies report the Air Quality Index (AQI) for cities across the US and parts of Canada and Mexico. AirNow data are used only to report the AQI, not to formulate or support regulation, guidance or any other EPA decision or position.
Copyright Text: US EPA, Office of Air and Radiation, Office of Air Quality Planning and Standards (OAQPS)
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