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please visit the following page for OMHCHO L2 readme file

https://www.cfa.harvard.edu/atmosphere/Instruments/OMI/PGEReleases/READMEs/OMHCHO_README_v3.0.pdf
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2018/08/14

 Reprocessed ovp files starting o74701 (07/31/22Z) to o74887

2017/04/26

 OMI transitioned into survival mode!
 NO data between o67327 (03/12) and o67401 (03/17)

2017/01/12

 Reprocessed OMI overpass files for orbits 66255-6, 66299, 66300, 66315-6, and 66414-9

2016/06/27

 Reprocessed overpass files for orbits 62352 - 63480
 (due to the KNMI request to start using the NSIDC issued daily NISE maps)

2015/03/16

 Reprocessed overpass files for orbits 56323 - 56328
 (due to Norway data recovery issue)

2015/01/15

 Reprocessed overpass files:
 replace ColumnAmountDestriped with ReferenceSectorCorrectedVerticalColumn (TotColAmtCorrected)

2014/12/11

 Reprocessed overpass files for orbits 55140 - 55141

2014/11/28

 Reprocessed overpass files for orbits 53601 - 54609
 (2014/08/13 00Z - 2014/10/21 05Z) for row anomaly correction

2014/07/11

 OMHCHO overpass files for the new version (3.0.2.3)
 for OMI row anomalies, use pixels that are not affected by OMI row anomalies (XTrackQualityFlags=0) only

2014/06/16

 Overpass files will be reprocessed once the L2 files for
 the new version (3.0.2.3) are available.

2013/08/12

 Reprocessed overpass files for orbit 48182

2013/08/05

 Reprocessed overpass files for
 orbit 46899-46904 and 46915-46918
 due to a solar eclipse problem that occurred during this time

2013/02/25

 Reprocessed overpass files between
 orbit 42795 (07/31/12) and orbit 45374 (01/25/13)
 due to a new set of row anomaly flags from KNMI

2012/09/04

 Reprocessed overpass files between
 orbit 41324 (04/21/12) and orbit 42898 (08/08/12)
 due to L1B flag table update