Smoke and gas emissions are byproducts released into the air from various sources, including vehicles, factories, and burning materials. These emissions can contain harmful substances like carbon monoxide, sulfur dioxide, and particulate matter, which can negatively impact air quality and human health. Regulations often aim to reduce smoke and gas emissions to protect the environment and public health. Technologies such as catalytic converters in cars and scrubbers in industrial plants help minimize these emissions, promoting cleaner air and a healthier ecosystem.