Understanding　the　risk　trade-offs　between　nitrogen　dioxide　(NO2)　and　ozone　(O3)　pollution　is　crucial　for　ozone　governance.　The　air　quality　health　index　(AQHI)　provides　a　more　comprehensive　measure　of　air　pollution　mixtures.　This　study　used　environmental,　meteorological,　and　health　data　of　13　cities　in　the　Beijing-Tianjin-Hebei　region　for　2018-2020　to　assess　the　health　effects　of　pollutants　during　both　cold　and　warm　seasons.　The　study　reveals　that　NO2　pollution　in　the　cold　season　(20.4-63.4　mu　g/m3)　is　more　severe　compared　to　warm　season　(18.3-49.7　mu　g/m3),　and　its　concentrations　have　been　decreasing　annually　in　most　cities.　However,　the　study　also　highlights　a　concerning　trend　of　increasing　ozone　concentrations　during　the　cold　season　across　all　cities　in　the　region　(The　average　annual　increase　is　3.5　mu　g/m3).　This　increase　may　be　linked　to　the　abatement　of　nitrogen　oxides　(NOX)　and　particulate　matter　(PM).　The　health　benefit　of　reducing　environmental　air　NO2　concentrations　maybe　offset　by　the　increase　in　O3　concentrations.　Emission　control　measures　to　reduce　nitrogen　dioxide,　sulfur　dioxide,　and　particulate　matter　levels　have　been　effective　in　reducing　the　negative　impacts　on　health　caused　by　air　pollution　in　various　cities　in　the　Beijing-Tianjin-Hebei　region.　It　was　necessary　to　construct　the　cold　season　AQHI　(AQHI-C)　and　warm　season　AQHI　(AQHI-W)　separately　in　the　Beijing-Tianjin-Hebei　region,　especially　for　the　assessment　of　health　risks　during　the　cold　season.