Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why ?
The different fuels used for cooking are wood, charcoal, cow-dung cake, kerosene, biogas, LPG, etc.
Among all these, biogas and LPG are least polluting. Both of these burn completely and do not give smoke. Also they do not leave any residue (ash, unburnt part, etc.)