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Your Air for October 26-27

Code Orange: UNHEALTHY for Sensitive Groups Particle Pollution Levels in Southern California

Friday, October 26 - Saturday, October 27: In southern California, multiple wildfires will lead to widespread Code Orange: UNHEALTHY for Sensitive Groups particle pollution levels throughout the region. Some smoke from these fires will be transported north into the San Joaquin and Sacramento Valleys Friday and Saturday, causing Air Quality levels to be Code Yellow: MODERATE. A weak upper-level ridge of high pressure building over the Pacific Northwest will limit vertical mixing, trapping pollutants near the surface and resulting in Code Yellow: MODERATE Air Quality levels in parts of western Washington and Oregon. High pressure over the Four Corners will lead to light winds, limiting pollutant dispersion and leading to Code Yellow: MODERATE Air Quality levels in Denver and the Salt Lake City area. Gusty winds and blowing dust will lead to Code Yellow: MODERATE Air Quality levels in the Phoenix area.

In the eastern U.S., scattered showers and high humidity associated with a low pressure system in the Midwest will enhance particle production. As a result, Code Yellow: MODERATE Air Quality levels are expected at several sites in Ohio and parts of Wisconsin.

More information about today's air quality in your city, state or region.

The updates warn of health effects you may experience within a few hours or days after breathing polluted air.

EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide.

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