Results and Impacts
Since its inception, CMAQ has been designed as a modular system able to incorporate data from related models that have alternate mathematical processes. This capability has allowed for inclusion of new science in the model to address increasingly complex air pollution issues. Thus, CMAQ has multi-pollutant capabilities to address diverse air quality issues such as photochemical ozone, airborne particulate matter, acid deposition, nutrient deposition and eutrophication, and air toxics. CMAQ is a truly multi-scale system that has been applied over hemispheric, continental, regional, and urban modeling domains with progressively finer resolution in a series of nested grids. The CMAQ modeling community includes researchers, regulators, consultants, and forecasters in government, academia, and the private sector with thousands of users worldwide.