Given a directory of AQS excel workbooks, reads the data from all the sheets (named "UNC"), which contain uncertainty values, and the data from the sheets (named "CONC") containing observed concentrations, and combines the values all into a single dataframe.
file path (relative or complete) of the folder containing the AQS files
character vector of year the data corresponds to
Many assumptions are made concerning the naming of the files. For more details, see the vignette describing the AQS data files
a dataframe of the aggregated data
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