Emissions from vehicular traffic contribute significantly to the level of volatile organic compounds VOCs in the atmosphere. VOCs are a group of carbon-containing compounds that easily evaporate at room temperature. They are released from both natural sources e.g., plants and anthropogenic sources e.g., industrial processes, fuel combustion, and consumer products . In the context of vehicular traffic, the primary sources of VOCs are:1. Evaporative emissions: These occur when fuel evaporates from the vehicle's fuel system, especially during refueling, and when the vehicle is parked in hot weather conditions. Evaporative emissions can also occur from the vehicle's exhaust system when it is not in use.2. Exhaust emissions: These are the VOCs released during the combustion of fuel in the vehicle's engine. Incomplete combustion of fuel can lead to the release of unburned hydrocarbons, which are a significant component of VOCs.The potential health and environmental impacts of VOCs from vehicular emissions include:1. Formation of ground-level ozone: VOCs react with nitrogen oxides NOx in the presence of sunlight to form ground-level ozone, a major component of smog. Ozone is a harmful air pollutant that can cause respiratory problems, aggravate asthma, and reduce lung function. It can also damage crops, forests, and other vegetation.2. Formation of secondary organic aerosols SOAs : VOCs can undergo chemical reactions in the atmosphere to form SOAs, which are tiny particles suspended in the air. These particles can contribute to the formation of haze and reduce visibility. They can also have adverse health effects, as they can be inhaled deep into the lungs and cause respiratory and cardiovascular problems.3. Toxicity and carcinogenicity: Some VOCs, such as benzene and formaldehyde, are toxic and can have harmful effects on human health. Long-term exposure to these compounds can increase the risk of cancer, damage the central nervous system, and cause other health problems.4. Contribution to climate change: Some VOCs, such as methane, are potent greenhouse gases that can contribute to global warming. Additionally, the formation of ozone and SOAs can also have indirect effects on the Earth's radiation balance and climate.To mitigate the health and environmental impacts of VOCs from vehicular emissions, it is essential to implement strategies such as improving vehicle fuel efficiency, promoting the use of alternative fuels and electric vehicles, implementing stricter emission standards, and developing better public transportation systems.