WEHOWorld Ecological Health Organization

Air Pollution and Health

What the WHO air-quality evidence says, and how to interpret guideline values.

What the evidence supports

Air pollution is a major environmental health risk. Fine particles and several gaseous pollutants are associated with respiratory and cardiovascular disease and other adverse outcomes; risks depend on pollutant, concentration, duration and susceptibility.

How to interpret it

WHO guideline values are evidence-informed public-health benchmarks, not a line between perfectly safe and dangerous air. Lower exposure generally reduces risk. Local action must also consider monitoring quality, sources, feasibility and unequal exposure.

Scope

This overview is educational and does not provide individual diagnosis, treatment or regulatory advice.

Sources

  1. WHO global air quality guidelines — Accessed
  2. WHO air quality guidelines Q&A — Accessed