[Concurrent Collection of Ammonia Gas and Aerosol Ammonium in Urban Beijing During National Celebration Days Utilizing an Acid-Coated Honeycomb Denuder in Combination with a Filter System].

Since 2013, the Chinese government implemented the Air Pollution Prevention and Control Action Plan. As a result, the atmospheric concentrations of sulfate reduced significantly, whereas the nitrate concentrations remain relatively high due to the excess of ammonia (NH). To date, there is no official observation network monitoring NH concentrations in China. Previous studies have focused on NH or ammonium (NH) separately. These limitations hinder a complete understanding of their dynamic changes due to the rapid gas-to-particle conversion. In this study, the concentrations of NH and NH were measured concurrently in urban Beijing during autumn 2019 utilizing an acid-coated denuder-filter combination with a time resolution from 2 h (PM>35 μg·m) to 5 h (PM<35 μg·m). The mean concentrations of NH and NH during the study were (4.1±2.9)μg·m and (1.7±1.4) μg·m, respectively. The temporal patterns of NH or NH coincided with that of PM, CO, and NO throughout the sampling period. The diurnal distributions of NH were bimodal, both on polluted (PM>75 μg·m) and non-polluted (PM<75 μg·m) days, peaking at 21:30-05:30 and 05:30-08:30, respectively. The NH concentrations on polluted days were relatively lower during 17:30-21:30, which may be related to higher wind speeds. In contrast to NH, NH had an obvious peak during 17:30-21:30 due to the formation of ammonium nitrate. The meteorological conditions favor the gas-to-particle conversion on polluted days, resulting in a lower NH/NH ratio of 0.8. However, this value may reach 2.8 on non-polluted days. The concentrations of NH, CO, NO, SO, and PM in the emission control period showed a significant increase greater than or comparable to those in the non-control period by 54.2%, 40.4%, 33.3%, 0%, and 49.4%, respectively. This result shows that the stagnant conditions offset the benefit of emission control actions implemented during and before the National Celebration Day.