The Southern Hebei of China has experienced an obvious increase of the haze occurrence frequency in the recent years. It has turned out to be one of the most seriously polluted areas in China. This study is aimed at quantifying the sources of the serious haze pollution over the Southern Hebei area, using the Mesoscale Modeling System Generation 5 (MM5) and the Models-3/Community Multiscale Air ...

The authors presented their efforts in examining the spatial and temporal distributions of air pollutants over China, with a full year simulation and local observations. Although the WRF/CMAQ model has been applied in many studies over East Asia recently, this full year simulation helps to probe into the modeling discrepancy and stability. The manuscript generally introduced the performance but...

0. The paper describes a bottom-up development and evaluation of a highly-resolved regional emission inventory for NMHCs in the area of Jiangsu, a strong industrialized region in Eastern China. The reference period is almost 10 years. The quantification of chemical processes is based on the determination of realistic source profiles for industrial activities by near-source measurements. The aut...

Nitrous oxide (N2O) is an important greenhouse gas and a primary cause of stratospheric ozone destruction. Despite its importance, there remain missing sources in the N2O budget. Here we report the formation of atmospheric nitrous oxide from the decomposition of ammonium nitrate via an abiotic mechanism that is favorable in the presence of light, relative humidity and a surface. This source of ...

The concentrations of five hazardous air pollutants were simulated using the community multi-scale air quality (CMAQ) modeling system. Annual simulations were performed over the continental United States for the entire year of 2001 to support human exposure estimates. Results are shown for formaldehyde, acetaldehyde, benzene, 1,3-butadiene and acrolein. Photochemical production in the atmospher...

The western United States experienced a record-breaking wildfire season in 2020. This study quantifies the contribution of emissions to exceedances health-based National Ambient Air Quality Standard (NAAQS) for fine particles (PM2.5) by comparing two CMAQ simulations, with and without emissions. During August October 2020, wildfires contributed 23% surface PM2.5 contiguous US (CONUS), larger Pa...

Abstract. To evaluate the improved emission estimates from online monitoring, we applied Models-3/CMAQ (Community Multiscale Air Quality) system to simulate air quality of Yangtze River Delta (YRD) region using two inventories with and without incorporated data continuous monitoring systems (CEMSs) at coal-fired power plants (cases 1 2, respectively). The normalized mean biases (NMBs) between o...