Number of Unhealthy Air Quality Days in L.A. Metropolitan Area

The Environmental Protection Agency (EPA) identifies the air quality of each day as one of the following categories with respective the Air Quality Index (AQI) levels:

• Good (≤50 AQI)
• Moderate (51-100 AQI)
• Unhealthy for sensitive groups (101-150 AQI)
• Unhealthy (151-200 AQI)
• Very unhealthy (≥200 AQI).

The number of unhealthy air quality days in the Los Angeles metropolitan area has remained high despite some variations across categories and years.  The data suggests that the Los Angeles metropolitan area should implement more eco-friendly policies and practices to reduce the number of unhealthy air quality days overall.