Download and produce yearly summer averages from daily OMI/Aura NO2 Column L3 Global Gridded data.
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Create an account at NASA GES DISC (https://disc.gsfc.nasa.gov).
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Create "./base/auth.txt" (set authUser, authPassword).
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Run files in "./data" in order of their file name.
Nickolay A. Krotkov (2013), OMI/Aura NO2 Cloud-Screened Total and Tropospheric Column L3 Global Gridded 0.25 degree x 0.25 degree V3, NASA Goddard Space Flight Center, Goddard Earth Sciences Data and Information Services Center (GES DISC), Accessed: [20-10-2019], 10.5067/Aura/OMI/DATA3007
More information: https://disc.gsfc.nasa.gov/datasets/OMNO2d_003/summary