Tucson, Arizona

====Light pollution====
Tucson and Pima County adopted [[Dark-sky movement|dark sky]] ordinances to control [[light pollution]] in support of the region's astronomical [[observatory|observatories]] in 1972.<ref>{{cite web |title=Light Pollution – Tucson/Pima County, AZ |website=The Public Good |date=January 12, 2009 |url=http://www.ilsr.org/rule/light-pollution/2466-2/ |access-date=June 10, 2013 |archive-url=https://web.archive.org/web/20130714040617/http://www.ilsr.org/rule/light-pollution/2466-2/ |archive-date=July 14, 2013 |url-status=dead }}</ref>  Last amended in 2012,<ref>{{cite web |title=Pima County approves changes to lighting ordinance |website=KVOA.com |date=March 13, 2012 |url=http://www.kvoa.com/news/pima-county-approves-changes-to-lighting-ordinance/ |url-status=dead |archive-url=https://web.archive.org/web/20131105113819/http://www.kvoa.com/news/pima-county-approves-changes-to-lighting-ordinance/ |archive-date=November 5, 2013}}</ref> the City of Tucson/Pima County Outdoor Lighting Code establishes maximum illumination levels, shielding requirements, and limits on signage in "continuing support of astronomical activity and minimizing wasted energy, while not compromising the safety, security, and well-being of persons engaged in outdoor nighttime activities."<ref>{{cite web |title=2012 City of Tucson/Pima County Outdoor Lighting Code |url=http://www.dsd.pima.gov/Building/Codes/OLC.pdf |publisher=Pima County Development Services |url-status=dead |archive-url=https://web.archive.org/web/20131014172124/http://www.dsd.pima.gov/Building/Codes/OLC.pdf |archive-date=October 14, 2013}}</ref>