What is the world wide trend in air pollution? On the surface North America and Europe have been gradually improving.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/world-wide-air-pollution-future
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asia
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kyoto-protocol
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nitrogen-dioxide
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-monoxide