Beijing and surrounding areas of China often suffer from choking smog.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/household-fuels-exceed-power-plants-and-cars-source-smog-beijing
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/eurek-alert
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indoor-air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/black-carbon
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution