Committee on the Medical Effects of Air Pollutants (COMEAP) is a group of scientific experts who provide independent and authoritative advice to the UK government on the health effects of air pollution. Its core members are typically senior academics or professionals drawn from fields such as atmospheric chemistry, environmental health, epidemiology, and toxicology; a single lay member helps to ensure the committee's technical work is accessible to the public.

COMEAP's periodic reports often make headline news on issues such as how many people die from air pollution, and the connections between air pollution and disease. In 2001, COMEAP warned that long-term exposure to particulates increases risk of premature death, especially from cardiovascular disease. One of its recent reports, issued in 2022, reviewed almost 70 epidemiological studies and concluded that air pollution is likely to increase the risk of cognitive decline and dementia in older people.