As an HVAC or IAQ expert, you know that exhaust emissions from cars, trucks, and other vehicles can have a negative impact on indoor air quality. But how do you explain this to homeowners? One way to start is by explaining that exhaust emissions contain a variety of harmful pollutants, including carbon monoxide, nitrogen oxide, and particulate matter. These pollutants can enter the home through open doors and windows, or they can be drawn in by the home's HVAC system. Once inside, they can build up to dangerous levels, posing a serious health risk to residents. Fortunately, there are steps homeowners can take to reduce the impact of exhaust emissions on their indoor air quality. For example, they can install an air filtration system or make sure their HVAC system is properly maintained. By taking these steps, they can help protect themselves and their families from the harmful effects of exhaust emissions.