Air quality in wildfire-stricken Los Angeles improved on Thursday from hazardous peaks hit earlier this month, as tiny soot particles that can penetrate the lungs and brain dropped to moderate levels,

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.

A wildfire smoke advisory remains in effect this weekend for most of Southern California due to wildfires in Los Angeles County.

Smoke from the raging Southern California wildfires is filling city skylines, causing officials to warn residents of hazardous air quality.

As the wildfires raged and smoke billowed across Los Angeles, officials issued air quality alerts, schools canceled classes and scientists warned about the dangerous - even fatal - consequences of wildfire smoke.

A quick-strike crew of Native American firefighters and journeymen utility workers from the Navajo Nation are helping Los Angeles residents cut through landslides, mangled trees and charred debris of

Two wildfires still burning in Los Angeles have torched more urban area than any other fire in California since at least the mid-1980s, an Associated Press analysis shows.

The scale of the effort will be vast — the area scorched by the major fires is equal to three times the size of Manhattan.