Overview
- Thick smoke from Canadian fires has put more than 100 million people in 18 states and Washington, D.C. under air‑quality alerts on Friday, with some areas reporting air judged unhealthy to very unhealthy.
- State and local agencies including the National Weather Service and Virginia DEQ have urged people to limit outdoor activity, keep windows closed, and use air filtration, with Virginia listing Hampton Roads, Northern Virginia/D.C., Richmond, Roanoke, and Winchester as hotspots.
- Meteorologists say a stationary high‑pressure heat dome over the central U.S. and southern Ontario is steering smoke south and east, and forecasts show the worst pollution shifting day‑to‑day with smoke likely to persist through the weekend unless winds shift or rain washes it out.
- Public‑health officials warn the smoke carries fine particulate matter called PM2.5 that can penetrate lungs and the bloodstream and worsen asthma, heart disease, diabetes, and other conditions, placing children, older adults, and people with chronic illness at greatest risk.
- While 2026 fires are extensive they are not as extreme as 2023, yet scientists note warming driven by fossil‑fuel emissions is lengthening smoke seasons and increasing health impacts, including studies that link wildfire particulate to thousands of excess deaths in recent years.