Crop burning, dust pollution, vehicular pollution, thermal power generation, have all been around for donkeys years. They all cause air pollution but are marginal contributors .
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pet-coke-imports-rose-five-fold-air-pollution-spiraled-last-three-years
[2] http://admin.indiaenvironmentportal.org.in/category/author/sunita-narain
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/economic-times-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/crops
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oil-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sunita-narain
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution