According to phyto-chemical composition of basil viz. 1. Rama tulsi (ocimum sanctum), 2. Krishna tulsi (ocimum
tenuiflorum), 3. Amrita tulsi (ocimum tenuiflorum), 4. Vana tulsi (ocimum gratissum), pudina (Mint), Ajwan(trachyspermum
ammi) are very much useful in the prevention of covid-19 pandemic, basil botanical species viz. (ocimum sanctum, ocimum
tenuiflorum, Amrita tulsi, ocimum gratissum also release oxygen 20 hours, 4 hours ozone by the absorption of carbon dioxide,
carbon monoxide and oxide of sulphure