These areas consist of dense housing mixed with commerce and industry and an infrastructure that falls short of modern standards. Incompatible land uses stand cheek by jowl,air and water pollution abound,noise and waste disposal problems are common.

• 这些旧区房屋挤迫，工商业混杂，基础建设也不符合现代标准，不但毗连的土地用途互不相容，而且空气污染、水污染、噪音及废物处置等问题也普遍存在。