A recent study in China has found that the risk factors of pneumonia are still higher in modern cities.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/living-modern-cities-ups-pneumonia-risk
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pneumonia
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wood
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases