云南边境五城市空气污染物分布特征

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Abstract The pollution characteristics, spatiotemporal variation and spatial heterogeneity was explored based on ambient particulate matter (PM with diameter £2.5µm [PM_2.5], £10µm [PM₁₀]) and gaseous pollutants (Ozone [O₃], sulfur dioxide [SO₂], nitrogen dioxide [NO₂], carbon monoxide [CO]) data collected from 2015 to 2021 in five border cities of Yunnan province. Annual average concentrations of ambient air pollutants fluctuate enormously and that of PM₁₀ (42.6±8.2)µg/m³ and PM_2.5 (25.4±4.2)µg/m³ exceed the Grade Ⅱ limit value recommended the Chinese Ambient Air Quality Standards (GB 3095-2012). The monthly average concentrations showed a U-shaped trend for PM, NO₂ and O_3-8h, and their concentrations peaked in March. PM and NO₂ concentrations followed a comparable seasonal pattern: spring>winter>autumn>summer. By contrast, seasonal average concentration of O_3-8h decreased as: spring>summer>autumn>winter and that of CO was the lowest in winter. In addition, SO₂ showed no obvious seasonal variation. Sen-MK results indicated a general trend of descending in daily average concentrations of ambient air pollutants and PM₁₀ had the highest decline rate at 11×10^-3µg/m³ per day, while an inverse trend of O_3-8h. The coefficient of variation (COD) revealed that the spatial distribution of ambient air pollutants is extremely uneven, especially for SO₂ with COD>0.2 but that of O_3-8h was more uniform in spring. Person correlation analysis supported a strong correlation between PM and NO₂, CO as well as O_3-8h, and correlations between PM and other pollutants are stronger in Xishuangbanna (BN) than other studied cities.

Key words： ambient air pollutants spatiotemporal variations Sen's slope heterogeneity person correlation

Received: 07 March 2022

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	LANG Li-jun
	CUI Xiang-fen
	SHI Jian-wu
	HUANG Jian-hong
	NING Ping
	HAO Ji-ming

Cite this article:

LANG Li-jun,CUI Xiang-fen,SHI Jian-wu等. Spatiotemporal characteristics of ambient air pollutants in five border cities of Yunnan province: variations[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5008-5015.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5008

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