| Title: | Wintertime characteristic of peroxyacetyl nitrate in the Chengyu district of southwestern China |
| Address: | "State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Haidian District, Beijing, 100871, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Haidian District, Beijing, 100871, China. jbzhang@pku.edu.cn" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-018-2412-5 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Atmospheric concentrations of peroxyacetyl nitrate (PAN) were measured in Ziyang in December 2012 to provide basic knowledge of PAN in the Chengyu district and offer recommendations for air pollution management. The PAN pollution was relatively severe in Ziyang in winter, with the maximum and average PAN concentrations of 1.61 and 0.55 ppbv, respectively, and a typical single-peak diurnal trend in PAN and theoretical PAN lost by thermal decomposition (TPAN) were observed. PAN and O(3) concentrations were correlated (R(2) = 0.52) and the ratios of daily maximum PAN to O(3) ([PAN]/[O(3)] ratio) ranged from 0.013 to 0.108, with an average of 0.038. Both acetone and methyl ethyl ketone (MEK) were essential for producing the acetylperoxy radicals (PA) and subsequently PAN in Ziyang in winter, and PAN concentrations at the sampling site exhibited more sensitivity to volatile organic compound (VOC) concentrations than nitrogen oxide (NO(x)) levels. Therefore, management should focus on reducing VOCs emissions, in particular those that produce acetone and MEK through photolysis and oxidizing reactions. In addition, the influence of relative humidity (RH) on the heterogeneous reactions between PAN and PM(2.5) in the atmospheric environment may have led to the strong correlation between observed PM(2.5) and PAN in Ziyang in winter. Furthermore, a typical air pollution event was observed on 17-18 December 2012, which Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and PSCF simulations suggest that it was caused by the local formation and the regional transport of polluted air masses from Hanzhong, Nanchong, and Chengdu" |
| Keywords: | Air Pollutants/*analysis Air Pollution/analysis/prevention & control China *Environmental Monitoring Peracetic Acid/*analogs & derivatives/analysis Seasons Chengyu district Pan PM2.5 and RH Regional transport Sensitivity; |
| Notes: | "MedlineZhu, Honglin Gao, Tianyu Zhang, Jianbo eng 2016YFC0202200 and 2017YFC0212400/the State Key R& D Program/ Germany 2018/06/04 Environ Sci Pollut Res Int. 2018 Aug; 25(23):23143-23156. doi: 10.1007/s11356-018-2412-5. Epub 2018 Jun 2" |
