Fig. 3: Time series of daily gapless PM2.5 for the year 2022.
From: First close insight into global daily gapless 1 km PM2.5 pollution, variability, and health impact
Time series of daily population-weighted mean PM2.5 concentrations (unit: μg m−3) as a function of the day of the year in 2022 (blue lines) for the a global world, b developed, and c developing countries, and six selected countries: d United States, e Brazil, f Australia, g Nigeria, h China, and i India. Orange lines in d–f show the daily PM2.5 time series for the El Niño fire year 2020. Red dashed ellipses outline days with anomalously heavy pollution. Inserted bar charts show the percentages of days (unit: %) exceeding the WHO-recommended short-term four interim targets [S-IT1(daily PM2.5 > 75 μg m−3), S-IT2 (daily PM2.5 > 50 μg m−3), S-IT3 (daily PM2.5 > 37.5 μg m−3), S-IT4 (daily PM2.5 > 25 μg m−3)], and air quality guideline (S-AQG) level (daily PM2.5 > 15 μg m−3), respectively.
