Nitrogen Oxides produced by huge fires and fossil fuel combustion are a major component of air pollution.They are the primary ingredients in ground-level ozone, a pollutant harmful to human health
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/air-pollution-role-nitrogen-oxides-emission-soil-underestimated
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-science