Mr. Obama left open the possibility the rule could be tightened in 2013.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/obama-asks-epa-pull-ozone-rule
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-wall-street-journal-hong-kong
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asthma
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lung-disease
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electricity
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy