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The Oregon Department of Environment Quality (DEQ)
During winter, DEQ issues Air Pollution Advisories for Particle Pollution (PM2.5) for any area of the state when cold temperatures and stagnant air cause particle pollution levels to rise.

An Air Pollution Advisory is a call-to-action that DEQ issues to encourage individuals and businesses to reduce pollution-producing activities during summer hot spells and winter air stagnation times.

DEQ issues an air pollution advisory when pollution levels rise and we expect an inversion to persist for more than 48 hours. This advisory is primarily a health message to protect sensitive individuals from adverse impacts from air pollution.