Editing Environmental noise (section)

== Emission ==

Noise from transportation is typically emitted by machinery (e.g. the engine or exhaust) and aerodynamic noise (see [[aerodynamics]] and [[aircraft noise]]) caused by the [[Compression (physics)|compression]] and [[friction]] in the air around the vessel during motion. Environmental noise from the railway specifically is variable depending on the speed and quality of the tracks used for transportation.<ref name=":0">{{cite journal |last1=Muzet |first1=Alain |title=Environmental noise, sleep and health |journal=Sleep Medicine Reviews |date=April 2007 |volume=11 |issue=2 |pages=135–142 |doi=10.1016/j.smrv.2006.09.001 |pmid=17317241 }}</ref>

Industrial and recreational noise could be generated by a multitude of different sources and processes. Industrial noise can be generated by factories and plants (i.e., product fabrication or assembly), power generation ([[hydroelectricity]] or [[wind turbine]]s), construction activities, or agricultural and meat processing facilities. Sources of recreational noise vary widely but they can include [[Loud music|music festivals]],<ref>{{Cite journal|last1=Lakin|first1=Curtis|last2=Brown|first2=Stuart|last3=Williams|first3=Martin|year=2001|title=Noise Monitoring at Glastonbury Festival|journal=Noise & Vibration Worldwide|language=en|volume=32|issue=5|pages=12–14|doi=10.1260/0957456011498669|bibcode=2001NVW....32...12L |s2cid=111208890|issn=0957-4565}}</ref> [[shooting range]]s, sporting events, car racing, woodworking, pubs,<ref>{{cite journal |last1=Ottoz |first1=Elisabetta |last2=Rizzi |first2=Lorenzo |last3=Nastasi |first3=Francesco |title=Recreational noise: Impact and costs for annoyed residents in Milan and Turin |journal=Applied Acoustics |date=April 2018 |volume=133 |pages=173–181 |doi=10.1016/j.apacoust.2017.12.021 |hdl=2318/1667120 |hdl-access=free }}</ref> people's activities on the street,<ref>{{cite journal |last1=Asensio |first1=Cesar |last2=Gasco |first2=Luis |last3=de Arcas |first3=Guillermo |last4=López |first4=Juan |last5=Alonso |first5=Jesus |title=Assessment of Residents' Exposure to Leisure Noise in Málaga (Spain) |journal=Environments |date=7 December 2018 |volume=5 |issue=12 |pages=134 |doi=10.3390/environments5120134 |doi-access=free }}</ref>  etc.

[[Sound propagation]] outdoors is subject to meteorological effects (e.g. wind, temperature) that affect the distance, speed, and direction with which environmental noise travels from a source to a listener.