Second national in-service emissions study (NISE2)
Motor vehicles are a major source of common air pollutants, including
hydrocarbons (HC), volatile organic compounds (VOCs), and oxides of
nitrogen (NOx). This major study of emissions from petrol engine vehicles in Australia provides current data (2008) and demonstrates the changes achieved since the first in-service emissions study in 1996.
The study report can be downloaded from the Department of the Environment website
The graph below show the average PM2.5 emissions for all vehicles tested. Almost all vehicles since 1999 are below 5 mg/km (milligrams per kilometre).