• An air quality alert is in effect for parts of California, including San Bernardino, Orange, and Riverside counties, due to high levels of particle pollution.
• The National Weather Service advises residents in affected areas to stay indoors and avoid strenuous outdoor activities until the alert expires Sunday evening.
• Particle pollution can cause respiratory problems, especially for children, the elderly, and those with pre-existing conditions; using air purifiers and keeping windows closed are recommended.