Estimating Ground-Level Ozone Concentrations in Eastern China Using Satellite-Based Precursors

The monthly ground-level ozone (O-3) concentrations in eastern China (EC) are estimated using the surface NO2 and CH2O concentrations derived from the ozone monitoring instrument (OMI) according to the geographically weighted regression (GWR) method. The accuracy assessment shows that the proposed GWR model performed well for estimating monthly O-3 concentrations (R-2 = 0.81, absolute error (AE) = 7.38 mu g/m(3) for the fitted results, and R-2 = 0.77, AE = 8.20 mu g/m(3)). The estimated yearly average O3 concentration is 56.20 mu g/m(3), with a standard deviation of 3.68 mu g/m(3) in 2014 across EC. The O-3 concentrations show great spatial variation, with hotspots extending from north-EC to the Yangtze River Delta and the Pearl River Delta. The monthly O-3 concentrations are generally low during the cold season and high during the warm season, but local areas show different seasonal variations.