At "hazardous" levels, the region is experiencing an air quality emergency. Those with chronic respiratory or cardiovascular conditions are more at risk of developing serious health issues as ...

Hazardous air quality levels are indexed at 300 or higher. As the day progressed, levels dropped from 325 to 182, improving the quality of the air to "unhealthy" rather than hazardous.

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 ...