Firefighters are making progress slowing the major fires in the Los Angeles area that have killed five people, ravaged communities from the Pacific Coast to Pasadena and caused thousands of people to flee their homes.

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.

By Jorge Garcia and Rollo Ross LOS ANGELES (Reuters) -Two massive wildfires menacing Los Angeles from the east and west were still burning uncontained on Thursday, but a brief respite from the fierce winds that have fanned the flames for two days allowed crews to slow their explosive spread.