Dangerous goods make up 10-15% of domestic freight and have potential to harm people, property and the environment. They include substances such as explosives, flammable liquids and gases, and oxidising agents. However, Government inspection programs were limited. The Office of Environment and Heritage carried out very few checks in the four years up to 2010, with no inspections made in the metropolitan area. This is despite Port Botany handling around 50,000 containers of dangerous goods per year. Statewide, only 303 inspections were made in 2009/10 and only 20 in 2008/09.