Objective systematically review the short-term exposure effects of atmospheric PM2.5 and respiratory disease outpatient visits in China.Methods Databases including CNKI, WanFang Data, VIP, PubMed, EMbase, The Cochrane Library and Web of science databases were electronically searched to collect studies on the association between atmospheric PM2.5 and outpatient visits of respiratory diseases from January 2000 to August 2022 in China. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies. Metaanalysis was performed by using Stata 14.0 software.Results Forty-eight articles were included. The random effect model was used for meta-analysis. The results showed that the increase of PM2.5 concentration by 10 μg·m-3 was associated with an increase of 0.66%(95%CI: 0.56%-0.76%) in the number of respiratory disease outpatient visits. Subgroup analysis was conducted according to population (age, gender), season, study area, urban economic level, PM2.5 concentration and effect type. The results showed that for every 10 μg·m-3 increase in atmospheric PM2.5 concentration, the increase of outpatient visits for respiratory diseases was the highest in the 0-14 years group 0.61%(95%CI: 0.50%-0.73%), followed by ≥65 years old group 0.50% (95%CI:0.35%-0.66%) and 15-64 years old group 0.44%(95%CI: 0.32%-0.56%). In spring, the highest increase was 0.61% (95%CI: 0.12%-1.11%). Compared with the second and third-tier cities, the increase of outpatient clinics for respiratory diseases in firsttier cities was the highest by 0.63% (95%CI: 0.50%-0.75%). The increase of outpatient clinics for respiratory diseases in southern China was 0.75%(95%CI: 0.63%-0.88%), higher than that in northern China 0.37%(95%CI: 0.28%-0.47%). PM2.5 <75 μg·m-3 groups of respiratory disease outpatient increment of 0.78% (95%CI: 0.63%-0.88%) was higher than PM2.5 ≥75 μg·m-3 group-0.26% (95%CI: 0.17%-0.36%). There was no significant difference in the increase of outpatient visits for respiratory diseases by gender and effect type. Sensitivity analysis showed that the results of this study were relatively robust and reliable. The funnel plot and Egger′s test showed that there was a certain publication bias.Conclusion There is a positive correlation between PM2.5 and the number of respiratory diseases in China. With the increase ofPM2.5 concentration in the atmosphere, the risk of respiratory diseases will increase, especially in children, the elderly, in spring, first-tier cities and the southern region, and the number of respiratory diseases outpatients increases.
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