The composite Air Pollution Score (APS), which aggregates exposure levels to these pollutants, indicated that individuals in the highest quintile of exposure faced significantly elevated risks of ...
Mammoth Cave National Park is famous for what's below the ground, featuring the world's longest explored cave system with hundreds of miles of passages and a unique ecosystem of fish, insects, worms ...
It was the most polluted day in the city since record-keeping began in 1999. The air quality index, a composite of five pollutants, skyrocketed to over 400; above 300 is considered hazardous.