Lailung vum tuamtu hlivua phunkhat Ozone tihnak heh Arctic Circle (Lailung saklam, Arctic ramsong) vum ai heh roh ngaiin paai thu UN in 5 Apr 2011 nia ah phuang i.
UN Report song ai Meterological Organization in he hmun ai Ozone hlivua heh 100 ah 40 (40%) paai/um lo ai, he hmusuakhnak heh 2010 kum hrek hnua an tun 2011 kum song ai zingzoihnak hmangin phuanghnak i.
Hetih bang ai roh zein le rang ze in Arctic Circle ram vum ai lailung tuamtu Ozone hnawm cak daan heh mithiam te in aaicaan roh ai, amah te ruathnak hnakin hnawm cak i.