世界气象组织：2024年世界气象组织空气质量与气候公报（英文版）

Global particulate matter concentrations in 2023 as recorded by two products Johannes Flemming, Allie Collow Particulate matter at the surface that is smaller than 2.5 micrometres in diameter is referred to as PM2.5. In ambient air, PM2.5 is a severe health hazard (World Health Organization, 2021). Anthropogenic and natural sources contribute to PM2.5 pollution in varying proportions at the global scale. Emissions of PM2.5 originate from human activity such as transport, industry and agricult