Toxic air spreads hundreds or even thousands of miles from where wildfires burn. Last week, Chicago felt the sting—and warnings weren’t enough to protect health.

Anyone who has experienced wildfire smoke knows how it can leave you with a scratchy throat, stinging eyes and impact your lungs. However, smoke can also affect your brain. Tiny airborne pollutants found in smoke have been linked to increased risk of stroke, dementia and flare-ups in neurological diseases like multiple sclerosis (MS).

On this Line One, join Dr. Justin Clark for a discussion about the health impacts of wildfire smoke and volcanic ash.

Claro Fire broke out near Lake San Marcos, California, sending smoke across Carlsbad, La Costa Oaks, and Encinitas. Evacuation order has been issued.

With seasonal wildfire smoke rolling into Calgary, residents often have questions about all the things that come with it.

As Alberta faces the prospect of another wildfire smoke-filled summer, experts are urging people to monitor conditions and take steps to protect their health.

Hazy and warm weather are on deck for Thursday in Massachusetts — but here's when the rain will start this weekend.

Rain overnight in Calgary did little to clear the wildfire smoke affecting the city, leading to an air quality warning early Thursday morning.