Fig. 4: Country- and city-level daily risk exposure to PM2.5 pollution.
From: First close insight into global daily gapless 1 km PM2.5 pollution, variability, and health impact
Scatter distributions of daily exposure risk showing the percentages (unit: %) of days exceeding the WHO-recommended four short-term interim targets: a S-IT1 (daily PM2.5 > 75 μg m−3), b S-IT2 (daily PM2.5 > 50 μg m−3), c S-IT3 (daily PM2.5 > 37.5 μg m−3), d S-IT4 (daily PM2.5 > 25 μg m−3), and e short-term air quality guideline (S-AQG) level (daily PM2.5 > 15 μg m−3) for each country (indicated by red diamonds) as a function of the logarithm of the population (unit: thousand) in 2022. Inserted subplots show the sorted daily exposure risk for each major city (indicated by blue dots). The top ten countries with the highest exposure risks for different WHO daily air quality standards are annotated in gray text. Note that the abbreviations for the labeled countries represent: AE United Arab Emirates, BD Bangladesh, BF Burkina Faso, BH Bahrain, CN China, EG Egypt, IN India, IQ Iraq, IR Iran, KW Kuwait, ML Mali, NE Niger, NG Nigeria, NP Nepal, PK Pakistan, QA Qatar, SA Saudi Arabia, TD Chad.
