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...el Kjær 2225.jpg|thumb|130px|right|[[Sound level meter]] used in measuring noise]] ...the USA it contributes more to environmental noise exposure than any other noise source, and is constituted chiefly of [[engine]], [[tire]], [[aerodynamic]]

...aust brakes, even when the performance is not as good, just because of the noise issues. This is particularly common for delivery vehicles.

...ion braking, a form of engine braking, produces extreme amounts of [[noise pollution]] if there is no [[muffler]] on the exhaust system of the engine. Use of a

*A [[catalytic converter]] to reduce [[air pollution]]. ...ler]] (USA) / [[Muffler|silencer]] (UK), to reduce [[Noise (environmental)|noise]].

...minerals, parking space and foreign exchange, reduced noise and chemical pollution, reduced hazard to others and etc. Reduced [[global warming]] from carbon

...on and wasted energy), and therefore higher power levels coupled with less pollution overall because of the greater efficiency. ...tion'') causing a disturbing "[[engine knocking]]" (also called "pinging") noise. Early research into this effect was led by A.H. Gibson and [[Harry Ricardo

...ng petroleum consumption and [[roadway air dispersion modeling|vehicle air pollution emissions]] worldwide. ...xample, people who are blind or visually-impaired, and who rely on vehicle-noise while crossing streets, find it much more difficult to do safely.

...e they can finally be extinguished, creating enormous volumes of toxic air pollution, oil, and [[heavy metal]]s. Some such fires have become [[Superfund]] clea * [[Noise mitigation]]

...] are frequently also mandatory. Since a moving bicycle makes very little noise, in many countries bicycles must have a warning bell for use when approachi ..., touring clubs, etc.) and for more global goals ([[energy conservation]], pollution reduction, promotion of fitness). Two broad themes run in bicycle activism