Urban street canyons are always blocked by upstream buildings. To evaluated the block effects on the air flow in a canyon, numerical simulations were conducted to investigate the impacts of the distances between the upstream building and the street canyon (D) on the air environment in the street canyons. In the range of the normal intervals between the buildings, the turbulence intensity, the averaged velocity and the fluctuation of the wind velocity in the street canyons would be decreased with increase of the value of D, and this would lead to increments of the averaged pollutant concentration by 36% within the canyon and by 41% in the near ground region if D increased from 15m to 60m. Therefore, large value of D is not necessary for building design in practice.
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