v0.0.6 (Feb 17, 2017) Only support ruby 2.0+, use v0.0.5 for ruby 1.9 v0.0.5 (Sep 17, 2016) New api for get available cities: ChinaAqi.available_cities # or ChinaAqi::AvailableCities.new.get # {"cities"=>["七台河", "三亚", "三明", "三门峡" ... Compatibility improvements.