If the air quality in your area is compromised, there are several things you can do to protect yourself. Special attention should be paid to those who have compromised respiratory, lung or heart health, as well as children and older adults who are generally more vulnerable.

Here's advice from SCAQMD: Avoid using indoor or outdoor wood-burning appliances, including fireplaces. Avoid vigorous physical activity. Keep windows and doors closed. Avoid using a swamp cooler or other fan that brings in outside air.

AirNow is a collaborative effort of federal agencies that provides air quality data across the U.S. The site also has up-to-date information about the wildfires, resources, data, and interactive maps to help users learn more about particular areas and how they might be affected. There's also a free AirNow mobile app.

Already known for having some of the worst air quality in the U.S., people in Southern California are now also at risk of inhaling smoke.

Millions woke up to hazy skies and poor air quality Wednesday morning as crews continued to fight the Palisades Fire in western Los Angeles, the Eaton Fire near Altadena and the Hurst/Sylmar Fire near Santa Clarita.

As thousands of acres burn across Southern California, wildfire smoke is causing poor air quality in the region and beyond.