The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

The items are intended as a temporary measure while the International Boundary and Water Commission and other entities work on permanent solutions.

The map pulls data from air monitors, hundreds of pollution sensors, and forecast models to provide real-time air quality index (AQI) readings for more than 1,000 locations. Los Angeles’ air ...

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.