{"url_path":"/weather/alerts/2.49.0.1.840.0.33d5a28ed9fd6ff85a636f240bf376c68be55a54.001.1","section_key":"alert","section_title":"Air Quality Alert issued July 18 at 12:13AM CDT by NWS Chicago IL","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-07-18","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.33d5a28ed9fd6ff85a636f240bf376c68be55a54.001.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Chicago IL"},"word_count":190,"has_tables":false,"body_markdown":"# Air Quality Alert: Air Quality Alert issued July 18 at 12:13AM CDT by NWS Chicago IL\n\n**Severity:** Unknown\n**Certainty:** Unknown\n**Urgency:** Unknown\n**Areas:** McHenry; Lake; Kane; DuPage; Kendall; Grundy; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will\n**Issued by:** NWS Chicago IL\n**Sent:** 2026-07-18T00:13:00-05:00\n**Effective:** 2026-07-18T00:13:00-05:00\n**Expires:** 2026-07-19T00:15:00-05:00\n\n## Description\nThe Illinois Environmental Protection Agency has determined that the\n\"Air Pollution Action Day\" designation will remain in effect for the\ngreater Chicago Metropolitan Area through midnight CDT tonight.\n\nA Chicago area \"Air Pollution Action Day\" is declared when weather\nconditions are such that widespread ozone and or particulate levels\nare expected to be at or above the Unhealthy for Sensitive Groups\n(USG) category of the Air Quality Index (AQI) for multiple days.\nOzone is expected to be the primary pollutant of concern although\nsmoke/PM2.5 may also become a concern later in the work week.\n\nActive children and adults, especially people with pulmonary or\nrespiratory disease such as asthma, should limit prolonged outdoor\nactivity.\n\nArea residents are urged to reduce pollution levels. Air quality\nforecasts, current air quality, and tips on how you can reduce your\nemissions can be found at www.airnow.gov\n\nMedia Contact...Illinois EPA"}