Health Impacts of Ambient Air Pollution

Ambient air pollution remains a leading environmental risk to human health, with fine particulate matter (PM2.5) and ozone (O3) among the most harmful components. Chronic exposure to PM2.5 is linked to cardiovascular disease, stroke, chronic obstructive pulmonary disease, lung cancer and adverse birth outcomes, while ozone contributes to respiratory inflammation and exacerbations of asthma. Long-term exposure also influences metabolic, neurological and immune function, amplifying the burden of non-communicable diseases. Global assessments attribute millions of premature deaths and hundreds of millions of disability-adjusted life years to ambient pollutants each year, with the highest impacts in rapidly urbanising regions and ageing populations. Although policy interventions targeting energy, transport, industry and residential emissions have yielded local improvements, persistent inequalities in exposure and emerging challenges from climate-driven weather extremes demand sustained efforts. Advances in satellite monitoring, atmospheric modelling and exposure–response analyses are refining estimates of source-specific health impacts, enabling more precise risk assessments and informing integrated mitigation strategies that yield co-benefits for climate and public health.

Research from Nature Portfolio

Recent studies have demonstrated a peak in global population-weighted PM2.5 concentrations around 2011, followed by steady declines attributable to strengthened emission controls in key regions. This reversal has decelerated the rise in PM2.5-attributable mortality and highlighted increasing marginal health benefits of further reductions as societies age. High-resolution exposure mapping combined with multiple atmospheric chemistry-transport simulations has quantified the avoidable deaths linked to fossil-fuel combustion, revealing that elimination of coal alone could avert over one million deaths annually. Sectoral analyses identify residential heating, industry and energy production as major contributors to ambient PM2.5, guiding targeted policy measures. Decomposition studies at national scale confirm substantial mortality reductions due to air quality actions, while emphasising that achieving future health targets will require more ambitious and sustained mitigation beyond initial policy cycles.

Health Impacts of Ambient Air Pollution publication trend

The graph below shows the total number of articles in health impacts of ambient air pollution across all publications each year (not limited to Nature Index journals).

Technical terms

PM2.5: Particulate matter with aerodynamic diameter less than 2.5 micrometres, capable of penetrating deep into the respiratory system and bloodstream.

Ozone (O3): A secondary pollutant formed by photochemical reactions of nitrogen oxides and volatile organic compounds, which irritates airways and impairs lung function.

Disability-adjusted life year (DALY): A metric combining years of life lost due to premature death and years lived with disability, used to quantify overall disease burden.

Integrated exposure–response (IER) function: A model that relates varying levels of pollutant exposure to health risks by integrating data from diverse sources, including epidemiological and toxicological studies.

References

1. Reversal of trends in global fine particulate matter air pollution. Nature Communications (2023).
2. Health benefits from the rapid reduction in ambient exposure to air pollutants after China's clean air actions: progress in efficacy and geographic equality. National Science Review (2023).
3. Estimates and 25-year trends of the global burden of disease attributable to ambient air pollution: an analysis of data from the Global Burden of Diseases Study 2015. The Lancet (2017).
4. An Integrated Risk Function for Estimating the Global Burden of Disease Attributable to Ambient Fine Particulate Matter Exposure. Environmental Health Perspectives (2014).
5. Source sector and fuel contributions to ambient PM2.5 and attributable mortality across multiple spatial scales. Nature Communications (2021).
6. Estimated Contributions of Emissions Controls, Meteorological Factors, Population Growth, and Changes in Baseline Mortality to Reductions in Ambient PM2.5 and PM2.5-Related Mortality in China, 2013–2017. Environmental Health Perspectives (2019).
7. Stronger policy required to substantially reduce deaths from PM2.5 pollution in China. Nature Communications (2020).
8. Pathways of China's PM2.5 air quality 2015–2060 in the context of carbon neutrality. National Science Review (2021).
9. Impacts of climate change on future air quality and human health in China. Proceedings of the National Academy of Sciences of the United States of America (2019).