Hii,The gas which is released due to "incomplete combustion" of fossil fuels such as petrol or diesel is called "carbon monoxide". In the outdoor environment, it is released by the vehicles and in indoor it is released by Furnaces and heaters. It is considered as an air pollutant because when it is inhaled, it causes drastic health alignments.

The physical property of Carbon dioxide gas is as follow:

-It is colorless, odorless and tasteless in nature.

-Highly poisonous in nature.

-It has the same density of air.

-It is non-corrosive in nature."