88877971_he_Environment_2011__SoE_2011__nts_and_fine_particles__PM2_5__Major_sources
[Pollutant] Nitrogen dioxide (NO2), together with nitric oxide (NO), generalised as NOx [Major sources] 
Combination of nitrogen and oxygen during high-temperature combustion of fossil fuels Around 80% of urban NO2 is from motor vehicle exhaust Other sources are petrol and metal refining, electricity generation from coal-fired power stations, other manufacturing industries and food processing
3.1 State and trends of Australia's atmosphere | 3 Ambient air quality and other atmospheric issues | 3 Atmosphere | State of the Environment 2011 (SoE 2011)
Major sources