Linked from
The 11 pages that link to Indoor air pollution, each with the reason it gives.
CharcoalRelated: Burning charcoal indoors can release carbon monoxide and fine particles.
PropaneRelated: Using propane without adequate ventilation can add pollutants to indoor air.
KeroseneRelated: Kerosene lamps and stoves can emit pollutants in poorly ventilated rooms.
Oil lampRelated: Poorly burning oil lamps can release soot and other pollutants indoors.
ChhaupadiRelated: Fires used for warmth in poorly ventilated shelters can expose occupants to smoke.