A multi-day ozone advisory went into effect Monday for parts of Los Angeles County, with unhealthy air quality possible through Friday evening as a heat wave affects the region.
The advisory, which began at 1 p.m. Monday, will remain in place until 8 p.m. Friday, according to the Los Angeles County Department of Public Health, citing the South Coast Air Quality Management District.
Air Quality Index levels could reach “Unhealthy” or higher in the Santa Clarita Valley and portions of the San Gabriel Valley, while “Unhealthy for Sensitive Groups” conditions or worse are possible in the San Fernando Valley and Pasadena, officials said.
Residents were urged to monitor local air-quality conditions and limit outdoor activities as necessary.
Public health officials recommended that people avoid vigorous physical activity when air quality is poor and remain indoors with doors and windows closed when possible.
People were also advised to limit the use of gasoline-powered lawn and garden equipment until evening, conserve electricity and delay trips to gas stations and the use of household chemicals until later in the day.
Those unable to keep their homes closed because of the heat were encouraged to seek air-conditioned public spaces such as libraries or shopping centers.
Officials said people experiencing severe coughing, shortness of breath, wheezing, chest pain, heart palpitations, nausea or unusual fatigue should contact a doctor or seek urgent care. Anyone experiencing life-threatening symptoms should call 911.