Links:
[1] http://re.indiaenvironmentportal.org.in/news/84-cities-submit-plans-improving-air-quality
[2] http://re.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://re.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[4] http://re.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[5] http://re.indiaenvironmentportal.org.in/category/thesaurus/national-clean-air-programme-ncap
[6] http://re.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[7] http://re.indiaenvironmentportal.org.in/category/thesaurus/air-pollution