Multiple wildfires are burning across Southern California, prompting air quality alerts for millions. The alert covers parts of Los Angeles, San Bernardino, and Riverside counties.
Key facts: - The Santa Rosa Island Fire has burned over 17,500 acres and is 44% contained. - Investigators are probing whether an SOS flare from a stranded boater sparked the Santa Rosa Island Fire.
- The Sandy Fire in Ventura County may have been ignited by a tractor striking a rock. - Fine particulate matter in smoke poses health risks, especially for vulnerable groups.
The air quality alert remains in effect until 10 p.m., and conditions may shift quickly.