Research on nanoparticle emissions from vehicles is still in the academic domain. This is largely because the uncertainty over formation of nanoparticles and their measurement methods. As a spillover, regulatory mechanisms are not yet able to take into account this new science. They still use mass of emitted particles
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/regulation-faces-hurdle
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution-control
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/spm
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-quality
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-standards
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/auto-technology
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/legislation
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/statistics