Air in the U.S. has gotten cleaner for decades, adding years to people's lives and preventing millions of asthma attacks, but nearly half of Americans still live with unhealthy air pollution, a new ...

Gases: These include nitrogen dioxide (NO₂) and ground-level ozone. “These are potent oxidisers,” says Dr Mahto. “When they touch the skin, they deplete your natural antioxidant reserves and trigger a ...