▁In ▁the ▁absence ▁of ▁this ▁cool ing ▁effect , ▁the ▁dominant ▁effect ▁of ▁changes ▁to ▁Ar ctic ▁clouds ▁is ▁an ▁increased ▁tra pping ▁of ▁inf ra red ▁radiation ▁from ▁the ▁surface . ▁ ▁Sh ip ▁em issions , ▁mer cur y , ▁al umin ium , ▁van ad ium , ▁mang an ese , ▁and ▁a eros ol ▁and ▁o zone ▁poll ut ants ▁are ▁many ▁examples ▁of ▁the ▁poll ution ▁that ▁is ▁affect ing ▁this ▁atmosphere , ▁but ▁the ▁smoke ▁from ▁forest ▁fires ▁is ▁not ▁a ▁significant ▁contrib utor . ▁Some ▁of ▁those ▁poll ut ants ▁figure ▁among ▁environmental ▁effects ▁of ▁coal ▁burning . ▁Due ▁to ▁low ▁de position ▁rates , ▁these ▁poll ut ants ▁are ▁not ▁yet ▁having ▁ad verse ▁effects ▁on ▁people ▁or ▁animals . ▁D ifferent ▁poll ut ants ▁actually ▁represent ▁different ▁colors ▁of ▁ha ze . ▁Dr . ▁Shaw ▁discovered ▁in ▁ 1 9 7 6 ▁that ▁the ▁yellow ish ▁ha ze ▁is ▁from ▁dust ▁storm s ▁in ▁China ▁and ▁Mong olia . ▁The ▁particles ▁were ▁carried ▁pole wards ▁by ▁unusual ▁air ▁curr ents . ▁The ▁tra pped ▁particles ▁were ▁dark ▁gray ▁the ▁next ▁year ▁he ▁took ▁a ▁sample . ▁That ▁was ▁caused ▁by ▁a ▁heavy ▁amount ▁of ▁industrial ▁poll ut ants . ▁ ▁A ▁ 2 0 1 3 ▁study ▁found ▁that ▁at ▁least ▁ 4 0 % ▁of ▁the ▁black ▁carbon ▁depos ited ▁in ▁the ▁Ar ctic ▁origin ated ▁from ▁gas ▁fl ares , ▁pre domin ately ▁from ▁oil ▁extra ction ▁activities ▁throughout ▁the ▁northern ▁lat