Sourceस्रोत
Medicinal smoke (Havan) reduces airborne bacteriaMedicinal smoke (Havan) reduces airborne bacteria
About this source (tier C)इस स्रोत के बारे में (स्तर C)
Not stated (listed source: Asian Agri-History) — India Environment Portal, 31 Dec 2007
Short excerpt about a study of smoke from natural products and airborne bacteria (Biolog microplate method). The page gives no results, authors or methods detail; treat the headline as an unverified claim.