银川市主要污染物变化特征及其关系研究

doi:10.3969/j.issn.1673-503X.2022.01.005

Abstract

Abstract:

Based on the monitoring data of concentrations of criteria air pollutants in Yinchuan from 2013 to 2019, we analyzed the variation of concentrations of criteria air pollutants in recent years and investigated the relationship among these air pollutants using the method of principal component analysis.The results showed that concentrations of all criteria air pollutants in Yinchuan decrease except for O₃ that exhibit an increasing trend.The O₃ concentrations observed at urban sites are lower than those observed at suburban background sites, whereas concentrations of other pollutants are relatively higher at urban sites.Both PM₁₀ and PM_2.5 concentrations at urban sites exceed the national secondary standard for air quality.Concentrations of all criteria air pollutants are highest in winter and lowest in summer, which is opposite to the seasonal variation of O₃ concentration.The diurnal variation of CO, NO₂, PM₁₀, and PM_2.5 shows a bimodal pattern, while the diurnal variation of O₃ and SO₂ exhibits a single peak.NO₂ concentration has a significant correlation with CO and O₃, and the PM₁₀ concentration has a significant correlation with PM_2.5 in Yinchuan.The first principal components of air pollutants include NO₂, CO, and O₃, with the variance contribution rate exceeding 50%.Moreover, the annual mean O₃ concentration gradually increases, which indicates that atmospheric photochemical pollution is worsening in recent years.

Key words: Yinchuan, Air pollutant, Annual variation, Diurnal variation

CLC Number:

Rui-na GAO,Yin-chuan SUN,He-jiang ZUO,Na GAO,Dai WANG. Variation and relationship of criteria air pollutants in Yinchuan[J]. Journal of Meteorology and Environment, 2022, 38(1): 33-39.

Figures/Tables 9

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References 21

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站点	CO/(mg·m^-3)	NO₂/(μg·m^-3)	O₃/(μg·m^-3)	PM₁₀/(μg·m^-3)	PM_2.5/(μg·m^-3)	SO₂/(μg·m^-3)
贺兰山马莲口	0.74	14.93	79.96	74.93	30.69	29.73
学院路	1.17	41.14	60.86	106.43	43.59	48.76
贺兰山东路	1.13	39.50	58.87	101.51	48.79	44.56
污染物浓度二级标准限值	4	80	160	70	35	60

站点	CO/(mg·m^-3)	NO₂/(μg·m^-3)	O₃/(μg·m^-3)	PM₁₀/(μg·m^-3)	PM_2.5/(μg·m^-3)	SO₂/(μg·m^-3)
贺兰山马莲口	0.9	14.2	88.5	73.1	34.7	35.4
银湖巷	1.2	38.3	64.0	130.5	58.5	69.2
宁安大街	1.0	33.7	57.6	128.8	58.5	62.5
宁化生活区	1.0	30.9	72.7	136.0	64.0	50.4
贺兰山东路	1.1	38.4	60.2	102.6	54.5	54.0
学院路	1.3	39.2	63.3	109.7	47.9	57.7
水乡路(直管站)	1.2	40.4	54.1	111.4	49.2	42.1
上海东路	1.3	42.4	58.6	87.7	47.4	63.8
文昌北街	1.4	33.3	62.7	102.2	54.4	49.2

污染物	CO	NO₂	O₃	PM₁₀	PM_2.5	SO₂
CO	1.000
NO₂	0.673^*	1.000
O₃	-0.583	-0.913^**	1.000
PM₁₀	-0.048	0.377	-0.379	1.000
PM_2.5	0.079	0.451	-0.450	0.897^**	1.000
SO₂	0.341	0.643	-0.527	0.483	0.533	1.000

主成分	特征值	特征值贡献率/(%)	累计贡献率/(%)
1	3.498	58.302	58.302
2	1.520	25.341	83.642
3	0.482	8.034	91.676
4	0.341	5.676	97.352
5	0.095	1.588	98.940
6	0.064	1.060	100.000

污染物	主成分1	主成分2
NO₂	0.903	0.340
CO	0.884	-0.159
O₃	-0.846	-0.342
PM₁₀	0.058	0.961
PM_2.5	0.172	0.937
SO₂	0.545	0.562

Variation and relationship of criteria air pollutants in Yinchuan

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