Which pollutant is specifically referred to as colorless and odorless?

Carbon monoxide is specifically referred to as colorless and odorless, making it particularly dangerous because it cannot be detected by human senses. This gas is produced from incomplete combustion of fossil fuels and is a common pollutant in environments with high traffic, such as urban areas or enclosed spaces with poor ventilation. Its undetectable nature allows it to accumulate in the bloodstream, where it can interfere with the body's ability to transport oxygen, leading to serious health risks or even death when inhaled in significant amounts. Understanding the properties of carbon monoxide is crucial for awareness and prevention of poisoning, particularly in homes where gas appliances are used.