Loads pre-generated .RData files containing recent AirNow data.
The daily files are generated once a day, shortly after midnight and contain data for the
previous 45 days.
For the most recent data, use airnow_loadLatest()
.
AirNow parameters include the following:
PM2.5
Avaialble RData and associated log files can be seen at:
https://haze.airfire.org/monitoring/AirNow/RData/latest