This new technology now means that the EPCA can conduct tests of Pollution by specific vehicles using lasers without stopping the car in question.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/forget-speed-guns-now-delhi-ncr-could-have-remote-puc-test-here%E2%80%99s-how
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-pollution-control-authority-epca
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sunita-narain
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution-under-control-certification