“…[24,25] The Indian incense sticks use coal powder and wood chips as the burning agent which have traces of toxic heavy metals (Cd, Cu, Cr, Co, Pb, Ni, Zn, Mo, Sr, Hg, and As), which could act as a significant threat to the environment and living beings. [9,[24][25][26][27][28][29] In the present review, the investigators have emphasized the various types of air pollution and their potential threat to the environment and living beings. Investigators have further emphasized household air pollution as a major cause of respiratory tract infections among human beings.…”