Chicago sees slight air quality improvement, but smoky hazy persists

After days of wildfire smoke blanketing the Chicago area, air quality improved Saturday, though it remained unclear when the lingering haze would fully clear. Air quality reached the "moderate" category Saturday, but an air quality alert remained in effect through Saturday night, according to the National Weather Service. Forecasters warned that conditions could deteriorate again later in the day as smoke concentrations fluctuate. “The general expectation is for a gradual deterioration in air…