pollutants :  carbon monoxide

Source:  It is produced by the incomplete burning of carbon-containing fuels ,  such as petrol , coal and wood .

Hazardous to health:  This is a poisonous gas which combine with haemoglobin in red blood cells to form a stable complex , carboxyhaemoglobin . The haemoglobin is thus not available for carrying oxygen to various parts of the body . Carbon monoxide can cause death even in relatively low concentrations . The danger from carbon monoxide is heightened by the fact that the gas is colourless , tasteless and odourless ; people succomb to its effects before they are aware of its presence .