The Community Multiscale Air Quality Modeling System
The NOAA-EPA National Air Quality Forecast Capability (NAQFC) operational ozone predictions are created using a system that consists of the Community Multiscale Air Quality (CMAQ) model driven by the North American Mesoscale (NAM) meteorological model. The operational CMAQ system running in NCEP uses CB05 chemical mechanism, latest point sources emissions, EPA NEI-2005 area and projected mobile sources and BEIS 3.1.3 biogenic emission. Its current domains cover CONUS, Hawaii and Alaska at 12km horizontal resolution and 35 vertical layers up to 100hPa. This system is running 4 cycles per day. The 18Z and 00Z cycles run forecasts to 6-hours, which provide the background fields for the 06Z and 12Z cycles which provide guidance to 48-hours.
The AQ model operational predictions are displayed by the National Weather Service's National Digital Forecast Database (NDFD), showing 1-hr/8-hr averages and daily maxima of 1-hr/8-hr averages of ozone. In addition, operational ozone predictions and testing of PM2.5 predictions are displayed at the links provided below.