The OMI/Aura Level-2 Total Column Ozone Data Product OMTO3 (Version 003) is made available (http://disc.gsfc.nasa.gov/Aura/OMI/omto3_v003.shtml) from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for the public access.
                    
OMI provides two Level-2 (OMTO3 and OMDOAO3) total column ozone products at pixel resolution (13 x 24 km at nadir) that are based on two different algorithms. This level-2 global total column ozone product (OMTO3)is based on the enhanced TOMS version-8 algorithm that  essentially uses the ultraviolet radiance data at 317.5 and 331.2 nm. OMI additional hyper-spectral measurements help in the corrections for the factors that induce uncertainty in ozone retrieval (e.g., cloud and aerosol, sea-glint effects, profile shape sensitivity, SO2 and other trace gas contamination). In addition to the total ozone values this product also contains some auxiliary derived and ancillary input parameters including N-values, effective Lambertian scene-reflectivity, UV aerosol index, SO2 index, cloud fraction, cloud pressure, ozone below clouds, terrain height, geolocation, solar and satellite viewing angles, and extensive quality flags.
  
(The shortname for this Level-2 OMI total column ozone product is OMTO3) 

The algorithm lead for this product is NASA OMI scientist  Dr. Pawan K. Bhartia ( Pawan.K.Bhartia@nasa.gov).
       
OMTO3 files are stored in EOS Hierarchical Data Format (HDF-EOS5). Each file contains data from the day lit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The maximum file size for the OMTO3 data product is about 35 Mbytes.
                   
Data Category Parameters:
       
       The OMTO3 data file contains one swath which consists of two groups:
       
       Data fields:
       OMI Total Ozone,Effective Reflectivity (331 - 360 nm), N-value,
       Cloud Fraction, Cloud Top Pressure, O3 below Cloud, UV Aerosol Index,
       SO2 index, Wavelength used in the algorithm, many Auxiliary Algorithm
       Parameter and Quality Flags
       
       Geolocation Fields:
       Latitude, Longitude, Time, Relative Azimuth, Solar Zenith and Azimuth,
       Viewing Zenith and Azimuth angles, Spacecraft Altitude, Latitude,
       Longitude, Terrain Height, Ground Pixel Quality Flags.