"Fewer fireworks have helped to decrease air pollution in some Chinese cities, but high readings of air pollutants have made many wonder if greater efforts need to be made, " Xinhua news agency comments.

BBC: China media: New Year haze

Most cities that topped the ALA's most polluted lists for particle and ozone pollution have seen their levels decrease.

FORBES: Magazine Article

Probably not: the price of sugar would drop, America's sugar industry would decline and the pollution of the Everglades would decrease.

ECONOMIST: Letters

In a mid-April report on greenhouse emissions, the agency now says that tighter pollution controls instituted by the industry resulted in an average annual decrease of 41.6 million metric tons of methane emissions from 1990 through 2010, or more than 850 million metric tons overall.

NPR: EPA Methane Report Further Divides Fracking Camps