"After 33 years of consideration, the Food and Drug Administration took steps on Tuesday to sort out the confusing world of sunscreens, with new rules that specify which lotions provide the best protection against the sun and ending claims that they are truly waterproof."

Dengue fever, a painful disease transmitted by mosquitos, is now showing up in Florida for the first time in more than 70 years. Climate change could be a factor.

"The government issued warnings on Friday about two materials used daily by millions of Americans, saying that one [formaldehyde] causes cancer and the other [styrene] might."

"At first glance the results of the fourth edition of the U.S. Environmental Protection Agency’s fourth National-Scale Air Toxics Assessment are sobering—the modeled data suggest that every person in the United States is at increased risk for getting cancer from outdoor air pollutants and that nearly a quarter of the population is at increased risk for certain noncancer health effects."

"Environmental health and autism experts Tuesday called for reform of the outdated U.S. law regulating chemicals, the Toxic Substances Control Act of 1976."

"Moderate increases in temperature and rainfall can herald cholera epidemics, a study in East Africa has found, and researchers urged governments to use those environmental cues to better protect vulnerable populations."

"A World Health Organization panel has concluded that cellphones 'possibly carcinogenic,' putting the popular devices in the same category as certain dry cleaning chemicals and pesticides, as a potential threat to human health."

"Japan will pay schools near the quake-ravaged Fukushima nuclear power plant to remove radioactive top soil and set a lower radiation exposure limit for schoolchildren after a growing outcry over health risks."