Not that long ago, most cities considered the solution to pollution to be dilution.

CNN: Polluted rivers stain Portland's image

The third letter was born in the middle of the 20th century, when we started realizing that the solution to pollution was not dilution.

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He added that the authority would analyse data from the scheme and was committed to working with KCC to tackle the city's traffic problems, lower pollution, ease flow, and find a permanent solution at Westgate Towers.

BBC: Westgate Towers road scheme 'dividing Canterbury' ends