Just a few hours of exposure to it can trigger serious health problems, especially among those who are already suffering from respiratory and asthmatic problems
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ozone-build-threat-delhiites
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-air-quality
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-pollution-control-committee-dpcc
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asthma
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cse
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer