Editing Paris (section)

===Water and sanitation===
[[File:Ile de la Cite from Pont de la Tournelle.jpg|thumb|The Seine, the [[Île de la Cité]] and a [[Bateau Mouche]]]]
Paris in its early history had only the rivers Seine and [[Bièvre (river)|Bièvre]] for water. From 1809, the [[Canal de l'Ourcq]] provided Paris with water from less-polluted rivers to the north-east of the capital.<ref>{{cite web |url=http://www.paris.fr/pratique/musees-expos/musee-des-egouts/visite-publique-des-egouts-de-paris/rub_9691_stand_5943_port_23931 |title=Historique des égouts |access-date=18 June 2013 |language=fr |publisher=Paris.fr |archive-url=https://web.archive.org/web/20140410232647/http://www.paris.fr/pratique/musees-expos/musee-des-egouts/visite-publique-des-egouts-de-paris/rub_9691_stand_5943_port_23931 |archive-date=10 April 2014 |url-status=dead}}</ref> From 1857, the civil engineer [[Eugène Belgrand]], under [[Napoleon III]], oversaw the construction of a series of new aqueducts that brought water from locations all around the city to several reservoirs.{{sfn|Burchell|1971|p=93}}

From then on, the new reservoir system became Paris's principal source of drinking water. The remains of the old system, pumped into lower levels of the same reservoirs, were from then on used for the cleaning of Paris's streets. This system is still a major part of Paris's water-supply network. Today Paris has more than {{cvt|2400|km|0}} of underground sewers.<ref name="sewers">{{cite web |url=http://www.paris.fr/portail/Environnement/Portal.lut?page_id=1313&document_type_id=5&document_id=2158&portlet_id=3139 |title=Les égouts parisiens |website=Mairie de Paris |access-date=15 May 2006 |language=fr |url-status=dead |archive-url=https://web.archive.org/web/20061003225317/http://www.paris.fr/portail/Environnement/Portal.lut?page_id=1313&document_type_id=5&document_id=2158&portlet_id=3139 |archive-date=3 October 2006}}</ref>

[[Air pollution]] in Paris, from the point of view of [[Particulates|particulate matter]] (PM10), is the highest in France with 38&nbsp;μg/m<sup>3</sup>.<ref>[http://www.linternaute.com/actualite/monde/classement-des-villes-selon-pollution-de-l-air/ Air pollution in Paris] {{Webarchive |url=https://web.archive.org/web/20120924012702/http://www.linternaute.com/actualite/monde/classement-des-villes-selon-pollution-de-l-air/ |date=24 September 2012 }} according to L'internaute</ref> From the point of view of nitrogen dioxide pollution, Paris has one of the highest levels in the EU.<ref>{{Cite web |date=24 December 2021 |title=Air pollution in Europe: These are the worst-hit cities to live in |url=https://www.euronews.com/green/2021/12/24/air-pollution-new-report-shows-which-european-cities-have-the-worst-air-quality |access-date=1 April 2022 |website=euronews |language=en |archive-date=1 April 2022 |archive-url=https://web.archive.org/web/20220401104131/https://www.euronews.com/green/2021/12/24/air-pollution-new-report-shows-which-european-cities-have-the-worst-air-quality |url-status=live}}</ref>