Projected health benefits of air pollution reductions in a Swedish population

TL;DR

This study shows that reducing air pollution in Sweden could significantly improve public health by lowering risks of diseases like heart attacks, strokes, and asthma.

Contribution

The study quantifies health benefits of modest air pollution reductions using a representative Swedish population sample and WHO guidelines.

Findings

A 1 µg/m³ decrease in PM2.5 is projected to reduce mortality by 1-2% and stroke incidence by 4% annually.

Air pollution reductions could lower childhood asthma cases and premature births by 3% and 2%, respectively.

Even minor air quality improvements are linked to significant public health benefits.

Abstract

A large part of the Swedish population is exposed to higher levels of air pollution than the health-centered air quality guidelines recommended by the World Health Organization (WHO).

The aim of the study was to illustrate the potential health benefits of cleaner air in Sweden by conducting a comprehensive health impact assessment, using a population sample of 100,000 individuals representing the country’s demographics.

Exposure-response functions for various health outcomes were derived from epidemiological literature, mainly from systematic reviews and low-exposure settings. Two hypothetical scenarios were studied: a 1 µg/m3 decrease in particulate matter with an aerodynamic diameter <2.5µm (PM2.5) and nitrogen dioxide (NO2), and a reduction in PM2.5 or NO2 from average exposure corresponding to Sweden’s Clean Air objectives to WHO’s air quality guidelines.

The findings demonstrated that even a modest decrease in air pollution concentrations can yield significant health benefits. For example, reducing PM2.5 by 1 µg/m3 was projected to correspond to a 1% to 2% decrease in mortality, a 2% reduction in myocardial infarction cases, a 4% decrease in stroke incidence, a 2% decline in chronic obstructive pulmonary disease, and a 1% decreases in lung cancer and type 2 diabetes annually. Moreover, this reduction is estimated to lower childhood asthma cases, incidences of hypertension during pregnancy, and premature births by 3%, 3% and 2%, respectively, each year.

The results highlighted that even minor enhancements in air quality would lead to substantial improvements in public health.

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