The Community Multiscale Air Quality Modeling System

The Operational NOAA-EPA National Air Quality Forecast Capability (NAQFC) ozone and fine particulate matter (PM2.5) predictions are produced twice daily to 48 forecast hours for the 06 and 12 UTC run cycles. The system consists of the Community Multiscale Air Quality (CMAQ) model, which is driven by the NWS North American 12 km meteorological model (NAM). The operational CMAQ v5.0.2 running at NCEP uses CB05 chemical mechanism, the AERO-5 aerosol chemistry, latest point sources emissions, EPA National Emissions Inventory 2014v2 area and mobile sources and Biogenic Emissions Inventory System that uses the Biomass Emission Land Database v3. Aerosol lateral boundary conditions are provided by the NWS GEFS-Aerosol global 4x/day predictions. Bias corrected ozone and PM2.5 predictions are also produced using the ESRL analog Kalman Filter method.


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.

National Air Quality Forecast Capability (NAQFC) : Official NWS site


NWS Air Quality Guidance