Significant impact of heterogeneous reactions of reactive chlorine species on summertime atmospheric ozone and free-radical formation in north China.

Heterogeneous reactions of NO, O, OH, ClONO, HOCl, ClNO, and NO, with chlorine-containing particles are incorporated in the Community Multiscale Air Quality (CMAQ) model to evaluate the impact of heterogeneous reactions of reactive chlorine species on ozone and free radicals. Changes of summertime ozone and free radical concentrations due to the additional heterogeneous reactions in north China were quantified. These heterogeneous reactions increased the O, OH, HO and RO concentrations by up to 20%, 28%, 36% and 48% for some regions in the Beijing-Tianjin-Hebei (BTH) area.

Personal exposure to PM in Chinese rural households in the Yangtze River Delta.

High levels of PM exposure and associated health risks are of great concern in rural China. For this study, we used portable PM monitors for monitoring concentrations online, recorded personal time-activity patterns, and analyzed the contribution from different microenvironments in rural areas of the Yangtze River Delta, China. The daily exposure levels of rural participants were 66 μg/m (SD 40) in winter and 65 μg/m (SD 16) in summer.

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate.

This study tested the mercury emission characteristics of six municipal solid waste incinerators (MSWIs) and recommended future mercury control via adjusting operational parameters. The results indicated that over 99% of the mercury in solid wastes ended in fly ash and flue gas, of which 3.3-66.