A main reason behind increase in PM10 levels is steep hike in number of vehicles in the city.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hyderabad%E2%80%99s-deadly-pm10-pollutant-particles-level-still-high
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-chronicle-telangana
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/telangana
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hyderabad-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution