The police have told the Delhi High Court that loudspeakers were permitted under noise pollution rules which only lay down restrictions, like timings and decibel level, to regulate their use.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/loudspeakers-permitted-under-noise-pollution-rules-delhi-police-tells-hc
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/religious-places
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-rules-2000
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment