▁chim ney ), ▁and ▁changes ▁to ▁user ▁behavior ▁( e . g . ▁dry ing ▁fuel ▁wood ▁before ▁use , ▁using ▁a ▁lid ▁during ▁cook ing ). " ▁Im pro ved ▁st ov es ▁are ▁more ▁efficient , ▁meaning ▁that ▁the ▁st ove ' s ▁users ▁spend ▁less ▁time ▁gather ing ▁wood ▁or ▁other ▁fu els , ▁suffer ▁less ▁em phys ema ▁and ▁other ▁lung ▁dise ases ▁pre val ent ▁in ▁smoke - filled ▁homes , ▁while ▁reducing ▁def or est ation ▁and ▁air ▁poll ution . ▁However , ▁a ▁closed ▁st ove ▁may ▁result ▁in ▁production ▁of ▁more ▁so ot ▁and ▁ult ra - f ine ▁particles ▁than ▁an ▁open ▁fire ▁would . ▁ ▁For ▁instance , ▁an ▁improvement ▁of ▁the ▁energy ▁efficiency ▁from ▁ 2 5 % ▁for ▁the ▁traditional ▁La o ▁st ove ▁( wood ▁and ▁char co al ▁fired ) ▁to ▁ 2 9 % ▁efficiency ▁for ▁an ▁improved ▁La o ▁st ove , ▁results ▁in ▁ 2 1 % ▁less ▁wood ▁fuel ▁being ▁needed , ▁and ▁saves ▁ 1 8 2 , 0 0 0 ▁ton ▁CO 2 eq ▁em issions , ▁as ▁reported ▁in ▁a ▁G H G - comp ens ation ▁project . ▁The ▁traditional ▁La o ▁st ove ▁needs ▁an ▁average ▁of ▁ 3 8 5 ▁kil og rams ▁of ▁char co al ▁and ▁ 4 5 0 ▁kil og rams ▁of ▁wood ▁per ▁year ▁as ▁fuel . ▁For ▁making ▁a ▁kil ogram ▁of ▁char co al ▁about ▁seven ▁kil og rams ▁of ▁wood ▁is