NOAA reported that six other arctic monitoring stations in their international cooperative air sampling network have reported CO2 concentrations of 400 ppm this spring.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/arctic-monitoring-stations-report-co2-levels-400-parts-million
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arctic
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/alaska
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/canada
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/iceland
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/finland
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming