Hello,

Currently, I am working on Sentinel 5p data in molecules/cm2. But I need to convert it to ppm (parts per million) in order to compare it with standard units in ppm or microgram/m^3.

I know the data here is column density and [ppm] is the number of compounds molecules divided by the number of air molecules (weighted), and in order to convert molecules/m^2 to ppm we need to divide it by the column length (length or height of the atmosphere which contains the NO2). Then one can convert to ppm, but the problem here is the concentration will be an average on all the column length (not on a specific region).

I would be very grateful if anyone can give me some suggestions.

Thanks