The National Weather Service said the alert will be in effect until Sunday morning in the Santa Clarita Valley and Saturday night in parts of Los Angeles, Ventura, San Bernardino, and Riverside counties.

Another air quality alert is in effect for Philly and its neighboring Pennsylvania counties Sunday, and it looks like more heat, and that summer of 2025 favorite — smoke — are poised to return during the week.

Air quality has taken a serious hit across the United States as a two-fold blow of wildfires in the West and in Canada have sent smoke pouring across large sections of the country — a problem that’s set to linger for days.