{"url_path":"/weather/alerts/2.49.0.1.840.0.a69fe03c5f0fcf20d36b9e7475e5140c5d53a3e3.003.1","section_key":"alert","section_title":"Air Quality Alert issued May 18 at 11:21PM EDT by NWS Boston/Norton MA","topic":"weather","document":{"doc_type":"alert","doc_date":"2026-05-18","source_url":"https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a69fe03c5f0fcf20d36b9e7475e5140c5d53a3e3.003.1","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"NWS Boston/Norton MA"},"word_count":137,"has_tables":false,"body_markdown":"# Air Quality Alert: Air Quality Alert issued May 18 at 11:21PM EDT by NWS Boston/Norton MA\n\n**Severity:** Unknown\n**Certainty:** Unknown\n**Urgency:** Unknown\n**Areas:** Western Essex; Eastern Essex; Western Norfolk; Southeast Middlesex; Suffolk; Eastern Norfolk; Northern Bristol; Western Plymouth; Eastern Plymouth\n**Issued by:** NWS Boston/Norton MA\n**Sent:** 2026-05-18T23:21:00-04:00\n**Effective:** 2026-05-18T23:21:00-04:00\n**Expires:** 2026-05-19T23:15:00-04:00\n\n## Description\nThe Massachusetts Department of Environmental Protection has issued\nan Air Quality Alert for Ground Level Ozone, from 11 AM to 11 PM EDT\nTuesday.\n\nAn Air Quality Alert day means that Ground Level Ozone\nconcentrations within the region may approach or exceed levels that\nare Unhealthy for Sensitive Groups.\n\nAir is unhealthy for sensitive children and adults, such as those\nwith asthma, lung or heart disease, and older adults. Sensitive\nchildren and adults should limit prolonged outdoor activity.\n\nFor additional information, please visit the Massachusetts\nDepartment of Environmental Protection website at:\nhttps://mass.gov/dep/massair/forecast"}