Understanding the chemical precursors of ground-level ozone may make it easier to prevent the pollutant from building up in the lower atmosphere.
Published Nov 7, 2017
NASA’s Aura satellite observes nitrogen dioxide hovering over many cities in the region, trapped by winter weather conditions.
Published Jan 18, 2013
Satellite data show that nitrogen oxide and carbon monoxide are not declining as much as projected by models.
Published May 31, 2018
Devices that limit NOx emissions from electric power plants have helped clear the air over the United States.
Published Jun 27, 2014
These maps show how the relative amounts of the key ingredients for ozone (smog) formation in the United States change throughout the summer.
Published Aug 7, 2009
On September 12, 2008, the Antarctic ozone hole reached its maximum size for the year.
Published Oct 25, 2008
While some forests emit volatile organic compounds that are involved in ozone pollution, history shows attempts to control smog have a better chance of succeeding by focusing on vehicle emissions.
Published Jul 16, 2014
