Separate local pollution standards may also be set for particular cities or regions. In 2013, a target of 60 PM2 5 pg/m3 was set for Beijing by 2017, and was achieved, according to the Beijing Municipal Environmental Protection Bureau. Motor vehicle engines produce a range of pollutants, including carbon monoxide, nitrogen oxides, particulate matter and hydrocarbons. Particulate matter pollution is also produced by vehicles from non-exhaust sources such as road, brake and tire wear.