Air pollution continues to be a significant health risk despite decreasing pollutant concentrations, according to a recent international study led by researchers from Helmholtz Munich. The study, published in The Lancet Planetary Health, analyzed data from 380 cities worldwide between 1995 and 2016 to assess the impact of air pollution on mortality.

The researchers utilized data from the Multi-Country Multi-City (MCC) Collaborative Research Network to understand the relationships between environmental stressors, climate, and health. Lead author Maximilian Schwarz from the Institute of Epidemiology at Helmholtz Munich highlighted the vast amount of data available through the network, allowing for a global analysis of air pollution’s health impacts over time.

Despite lower concentrations of pollutants such as particulate matter (PM10, PM2.5) and nitrogen dioxide (NO2), the study found that the risk of mortality has not significantly changed. This could be attributed to factors such as an aging population, changes in pollutant sources and composition, and regional variations in pollutant impacts.

The study focused on pollutants regulated by legal limits, excluding other potentially relevant pollutants like ultrafine particles. Schwarz emphasized the need for expanded monitoring and data availability to investigate new research questions more effectively.

In terms of health policy, Prof. Dr. Annette Peters, the director of the Institute of Epidemiology, stressed the importance of aligning air quality improvement efforts with the stricter recommendations of the World Health Organization (WHO). She highlighted the WHO’s updated air quality guidelines and the need for revising air quality limits at the European level to better manage the health risks posed by air pollution.

Overall, the study underscores the persistent health risks associated with air pollution, despite reductions in pollutant concentrations. It calls for more comprehensive monitoring, expanded research, and closer alignment with international health guidelines to address the ongoing challenges posed by air pollution.