# Air Quality Alert: McHenry; Lake; Kane; DuPage; Kendall; Grundy; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/5cba977f6cc79168

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-07-18 00:13 ingested 2026-07-18 15:07

[original source ↗](http://www.weather.gov/)

## extract

Air Quality Alert — McHenry; Lake; Kane; DuPage; Kendall; Grundy; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will
Severity: Unknown. Certainty: Unknown.
The Illinois Environmental Protection Agency has determined that the
"Air Pollution Action Day" designation will remain in effect for the
greater Chicago Metropolitan Area through midnight CDT tonight.

A Chicago area "Air Pollution Action Day" is declared when weather
conditions are such that widespread ozone and or particulate levels
are expected to be at or above the Unhealthy for Sensitive Groups
(USG) category of the Air Quality Index (AQI) for multiple days.
Ozone is expected to be the primary pollutant of concern although
smoke/PM2.5 may also become a concern later in the work week.

Active children and adults, especially people with pulmonary or
respiratory disease such as asthma, should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts, current air quality, and tips on how you can reduce your
emissions can be found at www.airnow.gov

Media Contact...Illinois EPA

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.