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'is_ARPALdf_AQ' checks if the input object belongs to the class 'ARPALdf_AQ'
is_ARPALdf_AQ(Data)
The function returns 'True' if the object is of class 'ARPALdf_AQ' and it returns 'False' if the object isn't of class 'ARPALdf_AQ'
Object to check if the class of a dataframe is 'ARPALdf_AQ', i.e. ARPAL dataframe for air quality data.
d <- get_ARPA_Lombardia_AQ_registry() is_ARPALdf_AQ(d)
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