#' Are measurements from given year, station, polutant available?
#'
#' @name availability
#' @docType data
#' @author Mateusz Staniak
#'
NULL
#' Codes (old & new) for stations (where pollution is measured)
#'
#' @name station_codes
#' @docType data
#' @author Mateusz Staniak
#'
NULL
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