India, April 24 -- A new report shows the state of air quality across the United States, identifying the metro areas facing the most severe pollution challenges in 2026.

The 27th annual "State of the Air" report by the American Lung Association evaluates ozone and particle pollution levels across counties, states and metropolitan regions.

Ground-level ozone remains one of the most persistent threats to air quality in urban America. Formed when emissions from vehicles, industrial facilities and other sources react in sunlight, ozone is a major component of smog.

Experts warn that rising temperatures are worsening the problem. Warmer conditions accelerate ozone formation, leading to more frequent spikes during summer months. These increa...