Even low-level exposure to particulate matter may accelerate brain atrophy and white matter changes in older adults, a ...

At issue are strengthened limits for iron and steel mills, which spew emissions that include lead, hydrogen chloride and ...

An open letter from activists urged the government to "take decisive and immediate action to confront one of the most urgent, ...

How can you minimize your exposure? How worried should you be about the health effects? And other questions, answered.