Air pollution is caused by:
- the many vehicles which Sydneysiders use to commute back and forth from school, work, etc.
- the industry and factories that work to build and construct new things for Sydneysiders to utilise.
Some of these are:
- CO (Carbon Monoxide)
- NO2 (Nitrogen Dioxide)
- SO2 (Sulfur Dioxide)
- PM (Particulate Matter)
As shown in the 'Central Tablelands' graph, the exceedences have dropped significantly. This is due to the rural environment of this are and the low number of industry and vehicles.
However, the number has increased in metropolitan areas like 'Sydney North-West' where there are a higher number of vehicles and industry.