Thousands of chemical compounds in wildfire smoke are interacting with each other and sunlight as the smoke travels. For people downwind, it can become more toxic over time.

Wildfires blanketing several Western cities are creating hazardous health conditions. Don't count on cloth masks to protect your lungs.

Wildfires blanketing several Western cities are creating hazardous health conditions. Don't count on cloth masks to protect your lungs.

Harvard University researchers, in collaboration with the U.S. Army Combat Capabilities Development Command Soldier Center and West Point, have developed a lightweight, multifunctional nanofiber material that can protect wearers from both extreme temperatures and ballistic threats.

In 2012, five women firefighters in San Francisco received a breast cancer diagnosis. That led many to question, "Is our job causing cancer?"

When police officers and firefighters feel that the public doesn't understand what they do, they're less likely to be proactive in building community ties.