During the begining of the monsoon heavy winds cause dust to fly from huge mounds which comprise waste from the gold mines which has been accumulated over a number of years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/dusty-way-ill-health
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolar-gold-field
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asthma
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tuberculosis
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining-waste
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining