Fused Discrete Air Quality Surfaces

This web page provides access to discrete, daily O3 and PM2.5 predictive surfaces. Here, a space-time hierachical Bayesian model (see HBMetadataAir for reference and model description) is used to fuse daily ozone (8-hr maximum) monitoring data from the National Air Monitoring Stations/State and Local Air Monitoring Stations (NAMS/SLAMS) with gridded output from the Models-3/Community Multi-Scale Air Quality Model (CMAQ). Similarly, fused discrete surfaces are produced for fine particulate data (24-hr average). These predictions represent average pollutant concentrations for CMAQ cells, not point predictions. Predictions are provided at the centroid locations (latitude, longitude) of all CMAQ cells. Daily predictive surfaces are available at the 12 km (Eastern US) CMAQ domains for 2001-06 (see HBMetadatdaAir for exact coverages). Beginning in 2007, daily predictions are provided for the entire conterminous US using the CMAQ 12 km national domain grid.

The date (month/last two digits of year) of the fusion runs is contained in the file names for the surfaces. The each day of the year, the files include the following variables: