Effect of air pollution on respiratory system outpatient visits in Xi'an city
Objective To explore the effect of air pollution on local residents'respiratory system diseases in Xi'an city,and to provide references for controlling air pollution and reducing the incidence of respiratory system diseases.Methods The daily air pollution status,meteorological data and the number of outpatient visits in the respiratory department of a tertiary hospital from January 1,2016 to December 31,2019 in Xi'an city were collected.The case-crossover design was used to analyze the relationship between air pollutants and outpatient visits.Results The hazards of particulate matter with an aerodynamic diameter<2.5 μm(PM2.5)and carbon monoxide(CO)were the most obvious when the cumulative lag of 4 d(lag04)[RR=1.017(95%CI 1.001-1.034),1.027(95%CI 1.001-1.054)],which only increased the number of respiratory outpatient visits for people>65 years old.When the particulate matter of aerodynamic diameter≤10 μm(PM10)and sulfur dioxide(SO2)increased by interquartile range(IQR)concentration in cumulative lag of 7 d(lag07),the risk of respiratory outpatient visits increased by 4.26%(95%CI 1.73%-6.87%)and 7.03%(95%CI 2.43%-11.84%),respectively.The harmful effect of PM10 on people<35 years old was the most obvious,and the effect of SO2 on people>65 years old was very strong.Elevated concentrations of nitrogen dioxide(NO2)and ozone(O3)only increased the number of outpatient visits to the respiratory system in people>65 years old.Conclusion The increase in the concentration of air pollutants PM2.5,PM10,SO2 and CO in Xi'an city can lead to an increase in the number of outpatient visits of respiratory system,and there is a lag effect.Elderly people should pay more attentions to the harm of NO2 and O3 to respiratory system.
air pollutionrespiratory systemdaily outpatient visitscase-crossover study
万方数据
维普
