When will the forest fire smoke go away?

Orange is "Unhealthy for Sensitive Groups." Red is "Unhealthy." Purple is "Very Unhealthy." (EPA AIRNow)

EUGENE, Ore. - When will the smoke go away?!

The Air Quality Alert for northwest Oregon now extends until noon Friday, the Lane Regional Air Protection Agency says.

"A Smoke Air Quality Alert has been issued. Wildfires burning in the region have resulted in air quality to reach unhealthy levels, which will continue at times through either late Thursday or early Friday," the updated alert read Wednesday morning. "However, conditions as a whole should gradually improve across most of the region through Friday."

AIR QUALITY | Lane County | State of Oregon

The tiny pollutants in smoke can penetrate deep into the lungs and cause health problems or aggravate existing conditions.

RELATED | 'Dust masks aren't enough!' What you need to know about health risks from wildfire smoke

"Pollutants in smoke can cause burning eyes, runny nose, aggravate heart and lung diseases, and aggravate other serious health problems," according to the alert. "Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition."

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