22 de dezembro de 2015
NASA satellite images: Which are the most polluted countries in the world?
Global satellite maps show the average concentration of nitrogen dioxide in the atmosphere in 2005 and 2014. Move the slider to see the difference in the levels -- blue indicates decreases and red shows increases. Source: NASA
The United States and Europe are among the world's largest emitters of nitrogen dioxide -- but both have also shown the most dramatic reductions in these emissions between 2005 and 2014, according to new global NASA satellite maps.Nitrogen dioxide is a yellow-brown gas that is a common emission from cars and industrial activity. It is a major respiratory pollutant in urban smog.