Emerging data indicate that tiny and toxic particles polluting urban air chemically morph from hour by hour, depending on what other pollutants these particles encounter during journeys that can run hundreds of miles.

Federal climate policymakers should have a grounding in basic chemistry.

Uncooked fish can host detectable concentrations of potentially toxic chemicals — pollutants that cooking can make disappear,

Yet another news story baits us with the promise of reading about noxious toxins – and doesn't deliver.

The failure of the G-8 Summit to put some teeth in greenhouse-gas limits suggests it may be time for a global climate czar.

At least one editor argues that maintaining the ethical behavior of journal authors requires constant policing.

A popular weed killer can feminize wildlife by tinkering with a gene that indirectly affects the production of sex hormones.