珠三角典型地区气态氨分布及其对PM<sub>2.5</sub>贡献

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Abstract To investigate the contribution of NH₃ to fine particulate matter (PM_2.5) in typical areas of the Pearl River Delta in Southern China, three urban sites (GYQ, MH, and DC) and one suburban site (HGS) in the Pearl River Delta were selected to carry out online monitoring of NH₃. Water-soluble inorganic ion, nitric acid (HNO₃), PM_2.5 and meteorological parameters were collected simultaneously. The characteristics of concentration level and diurnal variation of NH₃ were analyzed. The potential contribution of NH₃ to PM_2.5 was further evaluated. The observed results showed that the annual average of NH₃ at GYQ, MH, DC and HGS were (5.74±3.0), (4.70±2.41), (5.09۬.26) and (4.17±1.95) μg/m³ respectively. Except for GYQ, the seasonal variation of NH₃ in other sites showed an increasing trend of autumn > spring > summer > winter. The diurnal variation of NH₃ concentration is similar to that of temperature, and opposite to that of relative humidity. According to the adjusted gas ratio (AdjGR), all sites exhibited high levels of NH₃. With the increase of PM_2.5 pollution concentration, AdjGR gradually decreased, while the ammonium-to-total ratio of NH₃ (NHR) gradually increased. In addition, the NHR > 0.5 of the four sites mainly occurred under the meteorological conditions of temperature < 25℃ and relative humidity < 70%.

Key words： atmospheric ammonia fine particulate matter adjusted gas ratio secondary inorganic aerosol gas-to-particle conversion

Received: 26 February 2024

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X513

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	Articles by authors
	HUANG Guo-feng
	XIAO Lin-hai
	CHEN Zi-jie
	ZHANG Tao
	HONG Zhuang-min
	FANG Xiao-dan
	LIAO Tong
	CHEN Duo-hong

Cite this article:

HUANG Guo-feng,XIAO Lin-hai,CHEN Zi-jie等. Atmospheric ammonia distribution and contribution to PM_2.5 in typical areas of Pearl River Delta[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4796-4804.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I9/4796

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