The NYPD at 8 a.m. will conduct an urban airflow study that entails pumping low-concentrations of a harmless, invisible and odorless gas at several subway and street-level locations in Manhattan for 30 minutes. 
Further, air sampling will take place across the five boroughs. The test, the first of three, will help the NYPD determine the risks that airborne chemical, biological and radiological weapons can pose.
The NYPD will give a 24-hour notice before the remaining testing days. 
The NewsdayTV team looks at the most wonderful time of the year and the traditions that make it special on LI.  Credit: Newsday

'Tis the season for the NewsdayTV Holiday Show! The NewsdayTV team looks at the most wonderful time of the year and the traditions that make it special on LI.

The NewsdayTV team looks at the most wonderful time of the year and the traditions that make it special on LI.  Credit: Newsday

'Tis the season for the NewsdayTV Holiday Show! The NewsdayTV team looks at the most wonderful time of the year and the traditions that make it special on LI.

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