2012~2019年天津市公交站微环境空气质量改善

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Abstract Ambient air samples were collected at Tianjin Balitai Bus Station in September 2012, February 2014, June 2015 and June 2019 to analyze the overall improvement trend of atmospheric particulate matter (PM₁₀) pollution in the microenvironment as well as the characteristics of the carbonaceous components, water-soluble ionic components and elemental components in PM₁₀ and the differences between the four samplings. The results showed that the PM₁₀ concentrations of the four samples were respectively 281, 217, 188, and 78μg/m³, presenting a significant downward trend. The concentrations of water-soluble ionic and elemental components in PM₁₀ decreased year by year, while their proportions changed a little (22% and 39% separately). The proportion of secondary ions SNA (SO₄^2-, NO₃^-, NH₄⁺) in PM₁₀ of the 4samples was 11%, 9%, 9%, 17%. The concentrations of total carbon decreased year by year, while the proportion of the carbonaceous components in PM₁₀ showed a fluctuating upward trend (increase from 18% to 32%, with an average of 25%). According to the estimation results, the proportion of secondary organic carbon (SOC) in the 4samples in PM₁₀ was 4%, 9%, 9% and 13%, respectively. Our study shows that the air quality of the traffic microenvironment in Tianjin has been improved significantly, but the proportion of secondary components (SNA and SOC) in PM₁₀ showed an increasing trend, it is necessary to further strengthen the control of secondary pollution.

Key words： Tianjin bus station air quality PM₁₀ secondary pollution

Received: 09 February 2021

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X513

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	Articles by authors
	RAN Zheng
	YANG Liu
	HAN Kun
	YIN Xiao-ge
	QI Jing-yu
	WANG Wei-wei
	JIN Tao-sheng

Cite this article:

RAN Zheng,YANG Liu,HAN Kun等. Improvement of microenvironmental air quality in Tianjin bus stations from 2012 to 2019[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4549-4555.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4549

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