The U.S. Environmental Protection Agency (EPA) has released an updated version of its Community Multiscale Air Quality Model (CM AQ). According to EPA, the updated model allows scientists to analyze air quality at smaller, finer-resolution settings for individual towns and cities and model air quality for the entire northern hemisphere. Scientists currently use CM AQ to estimate air quality levels at regional and national scales. CM AQ uses meteorology and emissions data to evaluate air pollution trends and distribution. The system models multiple air pollutants, including ozone, particulate matter and air toxics. The National Weather Service also uses CM AQ to produce daily U.S. forecasts for ozone air quality. See EPA Press Release, October 19, 2011.