西宁市夏季居民区空气负离子浓度变化特征及其影响因子分析

doi:10.12118/j.issn.1000-6060.2023.428

Abstract

Abstract:

Positive and negative air ion concentrations were monitored in a typical residential area of Xining City, Qinghai Province, China, from May to October 2022. The temporal distribution characteristics of negative air ion concentration were analyzed, and air freshness and cleanliness were evaluated. The correlation between negative air ion concentration and concurrent meteorological conditions and air pollutant concentrations was investigated. The following are the study findings: (1) The negative air ion concentration in a typical residential areas of Xining City is higher in the morning than in the afternoon and night. The negative air ion concentrations from August to October are higher than those from May to July. (2) The change in the negative air ion concentrations in the Xining residential area is closely related to weather conditions during monitoring, following the pattern of “rainy>cloudy>sunny”. (3) High concentrations of negative air ions indicate that air is fresh but do not necessarily mean that air is clean. On sunny days, the negative air ion concentration in plateau cities are not high and air freshness is moderate; however, air cleanliness is high. (4) Relative humidity, sunshine hours, water vapor pressure, precipitation, and wind speed mainly affect the change in negative air ion concentration. Concentrations of NO₂, PM₁₀, CO, and PM_2.5inhibit the increase of negative air ion concentration. The results provide scientific data supporting living environment improvement, tourism health management, and ecological environmental protection in plateau areas.

Key words: residential areas, negative air ions, meteorological elements, air quality, Qinghai-Tibet Plateau, Xining City

MA Honglu, QI Donglin, ZHAO Tong, CAO Xiaoyun, ZHAO Quanning, ZHANG Rui. Variation characteristics and influencing factors of air negative ion concentration in summer residential areas of Xining City[J].Arid Land Geography, 2024, 47(8): 1358-1366.

Figures/Tables 9

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References 29

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浓度等级	空气负离子浓度（N）	说明
Ⅰ级	N≥1200	浓度高，空气清新
Ⅱ级	500≤N<1200	浓度较高，空气较清新
Ⅲ级	100≤N<500	浓度中，空气一般
Ⅳ级	0<N<100	浓度低，空气不够清新

评价指标	清洁度等级
评价指标	A	B	C	D	E
空气清洁度	最清洁	清洁	中等	容许	临界值
CI	≥1.00	(1.00, 0.70]	(0.70, 0.50]	(0.50, 0.30]	<0.30

月份	晴天	多云	阴天	雨天	平均
5	（85~922.5） 477.17	（120~1545） 516.62	（82.5~1565） 639.46	（240~2300） 804.55	（82.5~2300） 558.89
6	（365~757.5） 588.17	（290~912.5） 627.8	（400~1135） 711.09	（477.5~1097.5） 787.5	（290~1135） 645.19
7	（65~1020） 440.61	（130~1232.5） 606.81	（122.5~1870） 563.8	（322.5~1365） 775	（65~1870） 536.12
8	（257.5~640） 391.56	（192.5~2170） 450.65	（225~13310） 986.9	（672.5~48150） 5880	(182.5~48150） 1347.14
9	（102.5~3557.5） 495.22	（25~28270） 969.63	（157.5~14302.25） 2083.75	（632.5~26250） 8299.5	（25~28270） 2003.31
10	（177.5~755） 475.63	（50~1165） 590.66	（272.5~7257.5） 700.75	（357.5~21705） 7392.08	（50~21705） 835.79
平均	478.06	627.03	947.63	3989.77	-

月份	天气状况	6:00—9:00	10:00—13:00	14:00—17:00	18:00—21:00	雨天	阴天	多云	晴天	平均
5	浓度等级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅲ级	Ⅱ级
	q	1.64	1.75	1.47	1.54	1.14	1.56	1.57	1.73	1.59
	CI	0.45	0.49	0.46	19.34	117.30	0.56	0.43	0.38	5.77
	清洁度等级	D	D	D	A	A	C	D	D	A
6	浓度等级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级
	q	1.21	1.02	1.47	1.15	1.54	1.13	1.24	1.28	1.24
	CI	0.64	0.85	0.42	0.63	0.57	0.71	0.59	0.53	0.60
	清洁度等级	C	B	D	C	C	B	C	C	C
7	浓度等级	Ⅱ级	Ⅲ级	Ⅲ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅲ级	Ⅱ级
	q	1.26	1.79	2.37	1.01	1.11	1.36	1.31	1.71	1.48
	CI	6.46	0.54	2.02	0.93	9.22	5.85	0.58	0.43	2.67
	清洁度等级	A	C	A	B	A	A	C	D	A
8	浓度等级	Ⅰ级	Ⅱ级	Ⅱ级	Ⅱ级	Ⅰ级	Ⅱ级	Ⅲ级	Ⅲ级	Ⅰ级
	q	0.74	1.24	1.48	1.20	0.39	0.98	1.38	1.70	1.08
	CI	14914.71	0.81	1.10	1363.30	42807.48	818.12	35.54	0.33	5341.15
	清洁度等级	A	B	A	A	A	A	A	D	A
9	浓度等级	Ⅰ级	Ⅱ级	Ⅱ级	Ⅰ级	Ⅰ级	Ⅰ级	Ⅱ级	Ⅲ级	Ⅰ级
	q	0.63	2.92	1.56	1.38	0.01	0.61	2.42	1.10	1.42
	CI	5476.50	273.64	144.74	3339.30	26980.20	2918.55	2779.51	119.42	4976.14
	清洁度等级	A	A	A	A	A	A	A	A	A
10	浓度等级	Ⅱ级	Ⅰ级	Ⅱ级	Ⅲ级	Ⅰ级	Ⅱ级	Ⅱ级	Ⅲ级	Ⅱ级
	q	0.38	0.75	0.98	1.01	0.17	0.82	0.66	0.86	0.77
	CI	23.52	4616.10	1.05	0.91	28006.13	235.59	11.26	0.80	1104.39
	清洁度等级	A	A	A	B	A	A	A	B	A

Variation characteristics and influencing factors of air negative ion concentration in summer residential areas of Xining City

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