These zones could involve charges for the most polluting vehicles as well as incentives to switch to ultra low emission vehicles, including priority at bus lanes and traffic lights. (politics.co.uk)
Many of the newest alternative few vehicles are classified as zero emission vehicles as they do not emit any pollutants. (cheapcarinsurance.net)
Another meets the less - stringent «transitional» low - emission vehicle standard. (articles.orlandosentinel.com)