The push of marine air that cooled our region down overnight has provided a temporary improvement to our smoggy air.
But with temperatures forecast to increase again over the weekend, smog is once again expected to reach the "unhealthy for sensitive groups" category in many communities of the Cascade foothills of King and Pierce counties.
These outlying suburban and rural areas accumulate pollution generated by traffic and activities in the urban areas of Everett, Seattle and Tacoma.
Exposure to ground-level ozone can trigger asthma attacks, make breathing difficult, exacerbate lung and heart problems, and weaken the immune system.
People who are sensitive to air pollution should limit their time spent outdoors.
These conditions are expected to persist into mid-week.

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