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Factsheet on WHO AQG - Health Effects of Long-Term Exposure to NO2 and O3


In 2021, the World Health Organisation (WHO) published revised recommendations for ambient air quality (WHO 2021). To support this update, WHO published a review paper in 2020 evaluating the best available evidence on the effects of long-term exposure to nitrogen dioxide (NO2) and ozone (O3) (Huangfu and Atkinson 2020). Specifically, the research published updated quantified risk ratios for exposure to NO2 and all-cause and cause-specific premature mortality (people dying earlier than they otherwise would have). 1