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

The Air Quality Index measured 156 near Forks, Washington, and received a rating of "unhealthy," meaning some members of the ...

Air quality in Washington has greatly improved since 1991 when the Legislature ... By 2005 – thanks to federal, state, and local work – all 13 of those areas have met federal air quality standards.

We and local clean air agencies monitor and track emissions to make sure levels of outdoor air pollutants meet federal and state ... throughout Washington. Since 2000, we have been measuring air ...

Portions of central, north central, and northeast Oregon and central, south central, and southeast Washington ... of air pollution during periods of stagnant air, state air quality agencies ...