Since the start of the year, air pollution in major cities in India and Pakistan has reached levels well beyond what is considered hazardous to human health.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/winter-bites-air-pollution-india-and-pakistan-gets-%E2%80%98crazy-bad%E2%80%99
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/eco-business
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lahore
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangladesh
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dhaka
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolkata