A growing corpus of legal action, grounded in medical and scientific evidence on the harmful effects of environmental pollution, aims to defend human rights to life and health. Rachel Carson’s seminal 1962 book Silent Spring highlighted research on the health consequences of exposure to the agricultural pesticide dichlorodiphenyltrichloroethane (DDT). The outpouring of public concern that followed led to government restrictions on its use and, ultimately, a global ban in the Stockholm Convention on Persistent Organic Pollutants. However, such definitive legislative action in the light of scientific understanding of health risks is regrettably rare. Toxicologists and epidemiologists have shown how exposure to air and water pollution—and to toxic substances such as pesticides—can cause cancer, respiratory, neurological, and cardiovascular diseases, among others. Epidemiological evidence has shown the scale of the mortality and morbidity burdens of many sources of environmental pollution. Yet pollution is pervasive and relatively unhindered. Some of its health risks have been known since Victorian times, but air pollution remains one of the main environmental health risks in Europe,1 causing around 300 000 premature deaths annually in the EU.2 Even where pollution is regulated, standards often fall short of medical recommendations. For instance, 96% of the EU’s urban population is still breathing air that is above the World Health Organization’s (WHO) maximum recommended thresholds for fine particulate matter (PM2.5).3 Where policy making has fallen short, medical evidence has proved invaluable in …