National Outlook for October 25-26
Unhealthy Particle Pollution Levels in Southern CaliforniaThursday, October 25 - Friday, October 26: In southern California, multiple wildfires will lead to widespread Unhealthy for Sensitive Groups particle pollution levels throughout the region with isolated areas near San Diego reaching Unhealthy AQI levels. In addition, an upper-level ridge of high pressure in the West will limit mixing, allowing pollutants to build up near the surface. As a result, some cities in northern California as well as isolated cities in Utah, Colorado, and Texas will reach Moderate AQI levels for particles. Gusty winds and blowing dust will lead to Moderate AQI levels in the Phoenix area.
In the eastern U.S., an upper-level ridge or high pressure over the Midwest will limit vertical mixing, allowing pollutants to build up near the surface and resulting in Moderate AQI levels for much of Michigan and Ohio on Friday. Air quality is expected to be Good throughout the rest of the country.
Health Tip:
Cut back on strenuous outdoor exercise when air quality is expected to be unhealthy. Exercise during the early morning or late evening hours when ozone levels are at the lowest levels of the day. This is especially important for children and other sensitive groups. The booklet, Air Quality Index - A Guide to Air Quality and Your Health, contains information about the health effects of the five most common air pollutants, and how to avoid those effects.
How You Can Help: Reduce or eliminate fireplace and wood stove use when particle pollution levels are expected to be high. Reduce vehicle use.
Source: U.S. Environmental Protection Agency
