부산대학교 도서관

Exposure to PM2.5 can cause various diseases, including allergies, cardiovascular disease, and other related diseases. Therefore, in this study, the level of PM2.5 and potentially toxic elements (PTEs), including nickel (Ni), lead (Pb), chromium (Cr), arsenic (As), and cadmium (Cd), bound to PM2.5 in the indoor air of school were meta-analyzed. PubMed and Scopus were used to retrieve articles on the level of PM2.5 and PTEs in PM2.5 from 1 January 2000 to 20 July 2020. The level of PM2.5 and PTEs in PM2.5 was meta-analyzed based on the country subgroup in the random effect model. Seventy-six articles with 133 data reports were included in our study. Most people spend between 80 and 90 percent of their time indoors. The lowest and highest level of PM2.5 in the indoor air is in Greece (1.71 ug/m3) and Canada (313.39 ug/m3), respectively. The overall pooled level of PM2.5 was 16.29, 95%CI (14.37–18.22 ug/m3). The pooled level of PM2.5 in Canada, Poland, South Korea, Turkey, China, Qatar, India, Serbia, the UK, Taiwan, Iran, Kuwait, Spain, and Portugal was higher than the WHO guideline (25 ug/m3 24-h mean). The rank of PTEs in PM2.5 based on the overall level in the indoor air of urban schools was Ni (7.58 ng/m3) > Pb (6.52 ng/m3) > Cr (3.48 ng/m3) > As (1.61 ng/m3) > Cd (0.74 ng/m3). All counties’ pooled Ni and Cr in PM2.5 were higher than standard limits. Therefore, it is recommended to carry out control programs to reduce the emission of air pollutants around schools.