Fig. 1
From: DNA methylation: a potential mediator between air pollution and metabolic syndrome
Average air pollution (PM2.5) across 31 countries where data were available for all three time spots of 2016, 2018, and 2019. WHO GHO repository (https://www.who.int/data/gho/data/indicators/indicator-details/GHO/concentrations-of-fine-particulate-matter-(pm2-5)) and IQair Web site (https://www.iqair.com) are used to retrieve average air quality indices (AVG). P values of one-tailed paired T tests for 2016 vs. 2018, and 2019 measures were 0.0028 and 0.067, respectively