Chemistry, street canyon geometry, and emissions effects on no2 “hotspots” and regulatory “wiggle room”

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SUMMARY

    Poor outdoor air quality has been linked to a mortality burden of between 28,000 and 36,000 every year in the UK1 and 4.2 million deaths brought forward globally2; it also significantly increases the risk of respiratory diseases and has impacts on cognitive performance in particular with vulnerable groups3-5. Although single-box models (e_g, Pugh, et_al44) allow more complicated chemistry and/or microphysics to be incorporated, they cannot calculate within-canyon concentration gradients and chemical segregation45-48, which gives rise to highly localized pollution "hotspots". The authors used a two-dimensional . . .

     

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