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The U.S. Environmental Protection Agency has established Air Quality Indices (AQI) for several of the parameters for which there are air quality standards, but not all of the air quality related parameters that are measured have a defined AQI.  AQI have been established for the health-related air quality standards, but some of the standards, such as the 3-hour average sulfur dioxide standard, are based on other criteria (damage to vegetation).  Some air quality parameters are measured for which there are no AQI and reported on this website in terms of the 1-hour averaging time.  These 1-hour averages are subsequently combined and used to calculate longer averaging periods relevant to determining compliance with longer-term air quality standards.