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OA北大核心CSTPCD

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 Xini-ng 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,precipi-tation,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.