Small particles of air pollution and dust may play a role in enhancing a good monsoon while aggravating a poor one.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/iit-bombay-study-links-local-pollution-intensity-rain
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-technology-iit
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino