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This paper investigates the impacts of heating intensity and inflow wind speed on the characteristics of reactive pollutant dispersion in street canyons using the computational fluid dynamic (CFD) model that includes the transportation of NO, NO
2
, and O
3
coupled with NO-NO
2
-O
3
photochemistry. The results indicated that the heat intensity and inflow wind speed have a significant influence on the flow field, temperature field and the characteristics of reactive pollutant dispersion in and above the street canyon. With the street canyon bottom heating intensity increasing, NO, NO
2
and O
3
concentrations in street canyon are decreased. The O
3
concentration reductions are even more than the NO and NO
2
concentrations. Improving the inflow wind speed can significantly reduce the NO and NO
2
concentrations within street canyons. But the O
3
concentrations have a slight rise with wind speed increasing. The results would be useful for understanding the interrelation among reactive vehicle emissions, and provide references for urban planners.