Thousands advised to stay indoors in California, Oregon, Arizona

Parts of three states face potentially unhealthy levels of air pollution early Wednesday, a live map from AirNow shows.

The map shows multiple pockets of fine particle (PM2.5) pollution in the "unhealthy" category . In Arizona, the pocket is centered around Payson, while another area is located along the border between California and Oregon, encompassing parts of Red Rock Valley, Butte Valley, Tule Lake National Wildlife Refuge, Langell Valley, Spring Lake Valley, and areas around Klamath Falls.

At these air-quality levels, the Environmental Protection Agency (EPA) advises that sensitive groups avoid long or intense outdoor activities and consider moving or rescheduling them indoors. The EPA also recommends the remainder of the population to reduce long or intense activities, and to ta