To　investigate　the　air　pollution　characteristics　and　variation　trends　of　the　Central　Triangle　urban　agglomeration,　PM10　concentrations　from　2005　to　2014　for　seven　typical　cities　were　analyzed.　The　data　were　derived　from　the　data　set　of　Wuhan　et　al.　The　results　showed　that　at　least　75%　of　the　days　in　each　city　reached　the　secondary　standard　detailed　in　GB　3095-2012.Wuhan,　Changsha,　and　Changde　were　the　top　three　polluted　cities.　The　highest　levels　of　PM10　occurred　in　January　and　February,　whereas　the　lowest　levels　occurred　in　July.　A　small　peak　in　concentrations　was　detected　in　October.　On　a　seasonal　basis,　winter　was　found　to　be　the　most　polluted　season　followed　by　spring　and　autumn,　and　summer　was　found　to　be　the　least　polluted　season.　The　PM10　concentrations　decreased　from　2005　to　2012,　but　sudden　increases　were　apparent　in　2013.Afterward,　the　levels　decreased　again　in　2014.The　order　of　ambient　air　pollution　in　terms　of　degree　for　the　four　large　city　groups　was　as　follows:　Beijing-Tianjin-Hebei　(more　serious)　>　Central　Triangle　urban　agglomeration　>　Yangtze　River　Delta　>　Pearl　River　Delta　(less　serious).　Clearly,　additional　research　on　air　pollution　causative　factors　and　control　strategies　in　the　Central　Triangle　urban　agglomeration　is　of　great　importance.　©　2017,　Science　Press.　All　right　reserved.