In February, apart from particulate matter, gaseous pollutant ozone emerged dominant. Experts say ozone levels go up with the rise in temperature.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/odd-even-phase-ii-time-eye-ozone-well
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/odd-even-numbered-cars
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone-layer
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nitrogen-dioxide
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution