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Primary air pollutant in the Port Barrington area:
PM2.5 - 43 Good
Enjoy your outdoor activities.
Other Pollutants:
PM10 - 10 Good
OZONE - 35 Good
(Discussion Issued 7/27/26 2:00pm) Smoke/particulate guidance indicates areas of smoke moving across Illinois Monday night and into Tuesday. Highest concentrations of smoke are indicated from northern Illinois overnight Monday and traveling southward through the rest of the state on Tuesday. During this period, smoke models keep highest concentrations above the surface with smoke indicated at the surface not showing anything higher than Moderate level AQI for the day. However, there is a low chance of having a few higher hours of PM2.5 for short durations of time that could drive the NowCast AQI higher than Moderate tomorrow. For now, forecasts based on the daily average of particulates over a 24-hour period are for Moderate AQI in all Illinois forecast sectors. Current forecasts may be updated if smoke from aloft begins to work towards the surface more than anticipated. Note, NowCast AQI readings may show categories higher than the daily forecast to help identify periods of higher 1-hour PM2.5/smoke. For a description of the differences between daily AQI forecasts and NowCast AQI, visit https://www.airnow.gov/aqi/aqi-basics/using-air-quality-index/ . AQI Category Guidance for smoke/PM2.5 particulates https://www.airnow.gov/publications/activity-guides/air-quality-activity-guide-for-particle-pollution/
Primary Pollutant: PM2.5 - 0 Moderate
Secondary Pollutant: OZONE - 0 Moderate
Primary Pollutant: PM2.5 - 0 Moderate
Secondary Pollutant: OZONE - 0 Good
Primary Pollutant: PM2.5 - 0 Moderate
Secondary Pollutant: OZONE - 0 Good
Primary Pollutant: PM2.5 - 0 Moderate
Secondary Pollutant: OZONE - 0 Moderate