Air pollution is way down.....

Compared to the turn of the century...

Although we still have much progress to make on reducing emissions, new research suggests the situation could be worse.

According to a study by the Desert Research Institute, pollutant levels at the beginning of the 20th century were two to five times higher than current levels of pollution. Researchers attribute the decrease in pollution levels to the advent of more efficient coal-burning technologies, as well as legislation aimed at reducing emissions.