Variation characteristics and influencing factors of air negative ion concentration in summer residential areas of Xining City
Received date: 2023-08-14
Revised date: 2023-10-10
Online published: 2026-03-11
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 PM2.5 inhibit 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.
Honglu MA , Donglin QI , Tong ZHAO , Xiaoyun CAO , Quanning ZHAO , Rui ZHANG . 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 . DOI: 10.12118/j.issn.1000-6060.2023.428
表1 空气负离子浓度等级Tab. 1 Grade of negative air ion concentration |
| 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 |
表2 空气清洁度等级标准Tab. 2 Air cleanliness class standard |
| 评价指标 | 清洁度等级 | ||||
|---|---|---|---|---|---|
| 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 |
注:CI为安倍空气离子评价系数。下同。 |
表3 不同天气状况下西宁市居民区空气负离子浓度Tab. 3 Negative air ion concentration of residential areas of Xining City in different weather condition /个·cm-3 |
| 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 | - |
注:括号中数值为空气负离子浓度变化范围,括号下方数值为空气负离子浓度平均值。 |
表4 西宁市居民区空气负离子浓度等级及清洁度评价结果Tab. 4 Assessment result of negative air ion concentration grade and cleanliness for residential areas of Xining City |
| 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 |
注:q为单级系数。 |
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