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Loading from 2015-04-01 - 2015-05-01
Data taken from DMF, untarred, unzipped and renamed back to orignal file names

It was noted that BOTH TEI 42i's lost their internal Mass Flow Meters.  This was not consequential as the inlet has much better Mass Flow Controllers.  

Ambient data appear valid.  

Diurnal cycles of all three species are readily apparent.  

Multiple large (>100 ppbv) excursions noted.  These correlate very well with CO excursions.  They are very fast and so the NO2 values (which depend on a difference measurement) are not valid.  It is nearly impossible to discriminate these periods.  It is concluded that these periods MAY be due to local generator emissions and the associated variability with instrument/pump restarts.

NOx photolysis cell appears spot on with conversion efficiency.  NOy detector efficiency appears to be about 60% of nominal.  No correction was done.  

2015-04-09 03:45:00, 2015-04-13 17:11:00 DQR D150501.3 Instrument data system failed to start after unexpected power failure.  Unit was restarted upon observing failure.

2015-04-09 00:00:00, 2015-04-11 23:59:59 DQR: D150527.1 Standard addition turned off (or ran out).  Data unaffected.