Emissions from non-road spark ignition engines and equipment can be a significant source of air pollution in some urban air-sheds. These engines cover a wide range of petrol powered equipment, including:
• Marine engines, such as outboard, in-board and stern-drive engines
• Outdoor powered equipment (mainly garden equipment), such as trimmers, brush cutters, leaf blowers, chain saws, chippers, cement mixers, pumps and generators.
Such engines and equipment are a significant source of pollution because they don't have the same advanced emission controls found in on road engines. They emit air pollutants at much higher rates and contribute to ground level ozone formation.