▁these , ▁including ▁Bar ack ▁Ob ama , ▁Ang ela ▁Mer kel , ▁José ▁Luis ▁Rodríguez ▁Z ap ater o , ▁Stephen ▁Har per , ▁and ▁Nicolas ▁S ark o zy , ▁were ▁unable ▁to ▁travel ▁to ▁Poland ▁because ▁of ▁the ▁dis rupted ▁air ▁traffic . ▁ ▁There ▁was ▁also ▁a ▁wider ▁impact ▁on ▁the ▁econom ies ▁of ▁several ▁countries . ▁However , ▁there ▁were ▁some ▁environmental ▁advantages ▁ar ising ▁from ▁a ▁saving ▁of ▁around ▁ 1 . 3 ▁to ▁ 2 . 8 ▁million ▁t onnes ▁of ▁carbon ▁dio x ide ▁em issions . ▁ ▁Ash ▁cloud ▁maps ▁The ▁following ▁maps , ▁with ▁the ▁vol cano ▁in ▁red , ▁dep ict ▁the ▁progress ▁of ▁the ▁ash ▁cloud ▁during ▁the ▁period ▁of ▁dis ruption . ▁ ▁See ▁also ▁▁▁ 2 0 1 1 ▁er u ption ▁of ▁Gr í ms v ö tn ▁ ▁Cris is ▁situations ▁and ▁protest s ▁in ▁Europe ▁since ▁ 2 0 0 0 ▁ ▁Vol can ic ▁ash ▁and ▁av iation ▁safety ▁ ▁References ▁ ▁External ▁links ▁ ▁" Live : ▁Vol can ic ▁cloud ▁over ▁Europe " ▁updates ▁on ▁BBC ▁News ▁" Track ing ▁the ▁Can cell ations " ▁The ▁New ▁York ▁Times , ▁ 1 5 ▁April ▁ 2 0 1 0 , ▁updated ▁ 2 0 ▁April ▁ 2 0 1 0 ▁ ▁Vol can ic ▁Ash ▁Ad vis ory ▁Graph ical ▁Fore cast ▁for ▁the ▁North ▁Atlantic ▁region ▁ ▁Category : 2 0 1 0 ▁in ▁Europe ▁Category : 2 0 1 0 ▁in