Officials say they're trying to change their ventilation systems to limit the amount of smoke and debris blowing up from underground.
The Metropolitan Transportation Authority has tried to spray water and use plywood barriers to keep the dust contained. But residents on Manhattan's Upper East Side say it's still coming up.
The New York Times (http://nyti.ms/tCpnV1) says crews will resume blasting on Dec. 5.
The Second Avenue subway line will be 1.7 miles long. It's due to open in 2016. Work crews are blasting out areas for three stations.