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- W2021877375 abstract "The objective of this work is to examine the impacts of additional HONO sources on the chemical interaction between ozone (O3) and particulate matter with a diameter ≤ 2.5 µm (PM2.5). Three additional HONO sources, i.e. HONO emissions, the reaction of photo-excited nitrogen dioxide (NO2*) with water vapour (H2O), and NO2 heterogeneous reaction on aerosol surfaces, were inserted into the fully coupled Weather Research and Forecasting-Chemistry model to evaluate O3 and PM2.5 concentration enhancements in the Beijing–Tianjin–Hebei (BTH) region during August 2007. Results show that the additional HONO sources significantly increase O3 and PM2.5 concentrations during daytime. Up to 9 ppb enhancements of O3 and 32 µg m−3 increases in PM2.5 are found at seven urban sites over the BTH region. O3 increases are closely connected to PM2.5 increases over urban areas during daytime when the additional HONO sources are taken into account. PM2.5 inorganic components of SO42–, NO3– and NH4+ are increased by 5–18, 10–58 and 10–40%, respectively, over urban areas during daytime. The simultaneous increment of O3 and PM2.5 during daytime due to the additional HONO sources is related to the increasing oxidants (OH, H2O2 and O3) that enhance the atmospheric oxidising capacity. The concentration variations of O3 and PM2.5 under a variety of NOx, volatile organic compound and ammonia (NH3) emission control scenarios show that the additional HONO sources increase the sensitivity of O3 and PM2.5 concentrations to the changes of NOx emissions. An increase of the PM2.5 sensitivity to changes in NH3 emissions is also found. This indicates that without considering the additional HONO sources, the effectiveness of emission control strategies in reducing O3 and PM2.5 concentrations would be significantly underestimated." @default.
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- W2021877375 date "2015-01-01" @default.
- W2021877375 modified "2023-09-27" @default.
- W2021877375 title "Impacts of additional HONO sources on O<sub>3</sub> and PM<sub>2.5</sub> chemical coupling and control strategies in the Beijing–Tianjin–Hebei region of China" @default.
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- W2021877375 doi "https://doi.org/10.3402/tellusb.v67.23930" @default.
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