Synthesizing evidence and knowledge on air pollution

One of the key roles of WHO is to synthesize evidence on the effects of air pollutants on health. For decades, WHO has published various guidelines, in which it sets recommended limits for health–harmful concentrations of key air pollutants, both outdoors and inside buildings and homes, based on global synthesis of scientific evidence.

In addition to guidelines, WHO also publishes and is developing various training material for the health sector.