Photocatalytic　technology　has　shown　great　potential　for　purification　of　low-concentration　nitric　oxide　(NO)　pollution　due　to　its　energy-saving　property,　high　efficiency,　and　limited　secondary　pollution.　Among　various　semiconductors,　bismuth　oxyiodide　(BiOI)　photocatalyst　has　drawn　considerable　attention　in　recent　years　due　to　the　superior　photocatalytic　activity　and　stability,　since　its　narrow　band　gap　and　specific　layered　structure　is　in　favor　of　visible　light　absorption　and　electron-hole　pairs　separation.　Hence,　we　overview　the　latest　research　progress　in　the　photocatalytic　purification　of　NO　by　BiOI　and　introduce　the　influence　of　crystalline　morphology　and　facets　on　its　photocatalytic　performance.　The　modification　and　activity　enhancement　mechanism　of　BiOI　is　emphatically　expounded,　for　example,　surface　modification,　ion　doping　and　heterostructure　construction.　The　future　prospects　and　challenges　in　this　research　spot　are　put　forward　for　the　sake　of　providing　theoretical　reference　and　technical　support　for　the　design　of　highly　active　BiOI　and　the　efficient　purification　of　low　concentration　NO.　Key　words　bismuth　oxyiodide;　nitric　oxide;　photocatalysis;　atmospheric　contamination