Editing Vehicle emissions control (section)

==Remote sensing emission testing==
Some US states are also using a technology which uses [[infrared]] and [[ultraviolet]] light to detect emissions while vehicles pass by on public roads, thus eliminating the need for owners to go to a test center. Invisible light flash detection of [[exhaust gas]]es is commonly used in metropolitan areas,<ref>{{cite web |url= http://www.ecy.wa.gov/programs/air/pdfs/rsd.pdf |title= Infrared Remote Sensing Of On-Road Motor Vehicle Emissions In Washington State |access-date= 2009-03-23 |archive-date= 2010-12-31 |archive-url= https://web.archive.org/web/20101231012658/http://www.ecy.wa.gov/programs/air/pdfs/rsd.pdf |url-status= live }}&nbsp;{{small|(239&nbsp;KB)}}</ref> and becoming more broadly known in Europe.<ref>{{Cite web|title = Abgasmessungen RSD (Measuring pollutants by Remote Sensing in Zurich/Switzerland) by the Kanton's Office for Environmental Protection "awel" by means of equipment provided by Opus Inspection / etest.|url = http://www.awel.zh.ch/internet/baudirektion/awel/de/luft_klima_elektrosmog/verkehr/rsd.html|website = www.awel.zh.ch|access-date = 2016-02-23|archive-date = 2016-03-04|archive-url = https://web.archive.org/web/20160304192907/http://www.awel.zh.ch/internet/baudirektion/awel/de/luft_klima_elektrosmog/verkehr/rsd.html|url-status = live}}</ref>

===Use of emission test data===
Emission test results from individual vehicles are in many cases compiled to evaluate the emissions performance of various classes of vehicles, the efficacy of the testing program and of various other emission-related regulations (such as changes to fuel formulations) and to model the effects of auto emissions on public health and the environment.