Community Multiscale Air Quality (CMAQ) Modeling System

The Community Multiscale Air Quality (CMAQ) Modeling System is EPA’s premier modeling system for studying air pollution from global to local scales. For nearly a quarter century, EPA and states have used CMAQ—a powerful computational tool for translating fundamental atmospheric science principles to policy scenarios—to support air quality management. CMAQ is continually updated to incorporate new knowledge on the state-of-the science and use high performance computing power to characterize air quality more accurately and efficiently and to protect human health and the environment.