After addtional columns(i.e.
have been applied to an EPA dataframe, we are ready to
extract the PM2.5 values and store them in a
organized as time-by-monitor.
The first column of the returned dataframe is named
POSIXct time in UTC. Additional columns contain data
for each separate monitorID.
an EPA raw tibble after metadata enhancement
data dataframe for use in a ws_monitor object.
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