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Several important things to note about some of these products:

1. OMI is NOT sensitive to ozone near the surface. While there are derived tropospheric ozone products, they are currently unusable for AQ monitoring, particularly in the mid-latitudes = errors are large and the data are noisy. The bottom line is that retrieval of boundary layer O3 from satellite remote sensing remains a daunting task.

2. We do not include MOPITT measurements of CO because the spatial and temporal sampling is coarse, i.e. it takes 3 days for full coverage and the orbital geometry is such that there are large gaps between swaths of data.

3. Much of the data are available only in HDF format but there are a few websites that can provide ASCII or netCDF formats, or programs that will help ‘crack’ open the data.