Air pollution is caused by pollutants (such as nitrous oxides, carbon monoxide and particulates). These contribute to smog and can create health problems for people. The amount of pollutants your car emits depends on how cleanly it burns the fuel.
All cars that come into New Zealand are manufactured to an emissions standard. The following emissions standards are acceptable under New Zealand vehicle standards legislation:
Air pollution standards for cars that run on petrol relate to the allowed emission levels for:
Air pollution standards for cars that run on diesel include the allowed emission level for:
Air pollution ratings tell you how well your car performed against the emission standards when it was new. To make sure that your car stays as close as possible to the rating it was given when manufactured, make sure that you keep your engine well-tuned and maintained.
The more stars a car has for air pollution, the more environmentally friendly it is. Overseas manufacturers are progressively applying tighter standards in this area; better ratings mean better standards: