These models can help clear harmful particulates. Plus other steps you can take to improve indoor air quality.Left to right: Air purifiers from Alen, Blueair, and Coway.By Tanya A.

Smoke from Canadian wildfires is beginning to worsen air quality in the eastern U.S. as several Midwestern states battle conditions deemed unhealthy by the federal government

Smoke from wildfires burning in three Canadian provinces covered about a third of the U.S. on Wednesday, forecasters said, but had little effect on air quality except in New England and parts of New York state and the Midwest.