Q1: The most dangerous pollutant in vehicular emissions is

ANS:A - CO

The most dangerous pollutant in vehicular emissions is CO (carbon monoxide). Carbon monoxide is a colorless, odorless, and tasteless gas produced by the incomplete combustion of carbon-containing fuels such as gasoline and diesel in internal combustion engines. It is extremely hazardous to human health because it binds to hemoglobin in the blood more readily than oxygen, reducing the blood's ability to carry oxygen to vital organs and tissues. Prolonged exposure to elevated levels of carbon monoxide can lead to carbon monoxide poisoning, which can be fatal. While other pollutants such as sulfur dioxide (SO2), carbon dioxide (CO2), and ozone (O3) are also emitted by vehicles and contribute to air pollution and environmental problems, carbon monoxide poses the most immediate and severe health risks, especially in congested urban areas with high traffic volumes. Therefore, carbon monoxide (CO) is considered the most dangerous pollutant in vehicular emissions due to its potent effects on human health and well-being.