The plan calls for construction sites to limit construction activity that creates large amounts of dust, as well as asks industrial enterprises to reduce emissions, during hazardous pollution days.

该应急方案规定，严重污染日时，建筑施工工地应减少产生大量灰尘的施工行为，并要求工业企业减少排放。

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However, the high vacancy rates that are a legacy of the recession will limit new construction through 2013 at least.

FORBES: Real Estate Forecast 2013-2014: Commercial Properties

The pessimists argue that for all its construction boom (William Penn's statue, once setting a limit to any building's height, became a relative dwarf more than a decade ago), Philadelphia is still a laggard, slowed down by a history of outdated habits and infrastructure that does not apply to sunbelt cities such as Atlanta or Houston.

ECONOMIST: City life