Data format (ASCII) in the NO2 datafies:
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Date & Time (Local):     8/5/2019 5:00:00 PM,
Date & Time (UTC):       8/5/2019 9:00:00 PM,
NO2 Conccentration (ppb): 7.91073942184448
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Measurement time period and location: 

20180726-20180828: Steimann Hall 6th floor,CCNY campus (Lat/Long.: 40.821 North, -73.949 West)

20190805-20191015: Shed Lab/NYSDEC on Admin Building roof, CCNY campus
                  Lat/Long.: 40.819732 degree North, -73.948239 degree West  
20200513-20211231: Shed Lab/NYSDEC on Admin Building roof,CCNY campus
20220101-20221111: Shed Lab/NYSDEC on Admin Building roof,CCNY campus
                     
NO2 Analyzer model: Teledyne T500U
Time resolution: 1-min average

Monthly maintenance: 
Filter replacement,instrument time-clock cross-check and data download every month.

Contact: Yonghua Wu, yhwu@ccny.cuny.edu