A Guardian Exclusive: tiny particles produced by motor traffic can invade the brain and carry carcinogens
An article in the Guardian outlines a newly established link between cancer and air pollution.
“Environmental risks like air pollution are not large in magnitude – their importance comes because everyone in the population is exposed,” said Scott Weichenthal, at McGill University in Canada, who led the study. “So when you multiply these small risks by lots of people, all of sudden there can be lots of cases. In a large city, it could be a meaningful number, particularly given the fact that these tumours are often fatal.”
The research analysed the medical records and pollution exposure of 1.9 million adult Canadians from 1991 to 2016. Such large studies provide strong evidence, though not a causal link. Weichenthal said the correlation seen between brain cancer and nanoparticles was “surprisingly consistent”, but as this is the first study, it is important that other researchers replicate it.