EPA scientists have developed a set of modeled meteorology, emissions, air quality and pollutant depositions spanning the years 2002 through 2019 called EPA’s Air QUAlity TimE Series Project (EQUATES). The air quality and deposition data are being used by epidemiologists and ecologists to study decadal trends in pollution and link air quality to adverse health and ecological effects. The meteorology and emissions data are being used to test if updates to the air quality modeling system based on new scientific research improve the estimation of pollutants such as ozone and particulate matter. Developers of the database will provide information about EQUATES and how it can be applied, and users of the data will offer additional perspective. More information on EQUATES.