[Feature] The polluted brain

Some of the health risks of inhaling fine and ultrafine pollutant particles are well-established, such as asthma, lung cancer, and, most recently, heart disease. But a growing body of evidence suggests that such exposure can also harm the brain, accelerating cognitive aging, and may even increase risk of Alzheimer's disease and other forms of dementia. The link between air pollution and dementia remains controversial—even its proponents warn that more research is needed to confirm a causal con