airnow_createMonitorObjects: Obain AirNow data and create ws_monitor objects
Description
This function uses the airnow_downloadParseData function
to download monthly dataframes of AirNow data and restructures that data into a format that is compatible
with the PWFSLSmoke package ws_monitor data model.
AirNow data parameters include at least the following list:
BARPR
BC
CO
NO
NO2
NO2Y
NO2X
NOX
NOOY
OC
OZONE
PM10
PM2.5
PRECIP
RHUM
SO2
SRAD
TEMP
UV-AETH
WD
WS
Setting parameters=NULL will generate a separate ws_monitor object for each of the above parameters.