Identification of Major Sources of Atmospheric NH3 in an Urban Environment in Northern China During Wintertime,Environmental Science & Technology

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Identification of Major Sources of Atmospheric NH3 in an Urban Environment in Northern China During Wintertime
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-05-15 00:00:00 , DOI: 10.1021/acs.est.7b00328
Xiaolin Teng ₁ , Qingjing Hu ₂ , Leiming Zhang ₃ , Jiajia Qi ₁ , Jinhui Shi ₁ , Huan Xie ₁ , Huiwang Gao _{1,

4} , Xiaohong Yao _{1,

4}

Affiliation

To assess the relative contributions of traffic emission and other potential sources to high levels of atmospheric ammonia (NH₃) in urban areas in the wintertime, atmospheric NH₃ and related pollutants were measured at an urban site, ∼300 m from a major traffic road, in northern China in November and December 2015. Hourly average NH₃ varied from 0.3 to 10.8 ppb with an average of 2.4 ppb during the campaign. Contrary to the common perspective in literature, traffic emission was demonstrated to be a negligible contributor to atmospheric NH₃. Atmospheric NH₃ correlated well with ambient water vapor during many time periods lasting from tens of hours to several days, implying NH₃ released from water evaporation is an important source. Emissions from local green space inside the urban areas were identified to significantly contribute to the observed atmospheric NH₃ during ∼60% of the sampling times. Evaporation of predeposited NH_x through wet precipitation combined with emissions from local green space likely caused the spikes of atmospheric NH₃ mostly occurring 1–4 h after morning rush hours or after and during slight shower events. There are still ∼30% of the data samples with appreciable NH₃ level for which major contributors are yet to be identified.

更新日期：2017-05-27

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