Increased traffic because of the scale of the development of sites BA1 to BA4 and BA10 will cause serious pollution in the town and surrounding area. It is likely that air quality standards will be breached in the Whitehorse Street / Royston Road areas and possibly in much of the rest of the town. Para 9.28 notes that these areas are close to breaching these standards already.
The loss of so much Green Belt will remove the "green lung" which surrounds the town at present and helps mitigate this problem.