Definition of data columns:

1) yy year (all times in MST)
2) mm month
3) dd day
4) hr hour
5) doy day of year (1-365 or 366 depending on whether there is a leap year)
6) wkn week number (1-52)
7) dow day of week (0 = Tues, 1 = Wed, 2 = Thurs, 3 = Friday, 4 = Saturday, 5 = Sunday, 6 = Monday)
8) h22 valley heat deficit (megajoules per square meter) integrated to 2200 m MST. See our publication for further information on the calculation of this thermodynamic quantity and note that the best relationship between this quantity and PM2.5 concentration is for an integration to 2200 m MSL (i.e., this value and NOT h18).
9) sm22 mean vector average wind speed (m/s), surface to 2200 m MSL (valley floor is 1288 m MSL)
10) dm22 mean vector average wind direction (deg true), surface to 2200 m MSL
11) hm22 mean relative humidity (%), surface to 2200 m MSL
12) tm22 mean temperature (°C), surface to 2200 m MSL
13) st22 wind speed (m/s) at the top of the atmospheric column at 2200 m MSL
14) dt22 wind direction (deg true) at the top of the atmospheric column at 2200 m MSL
15) ptt22 potential temperature (K) at the top of the atmospheric column at 2200 m MSL
16) um22 mean west-east component of the surface to 2200 m MSL vector average wind (m/s). Positive for winds blowing from west to east, negative for winds blowing from east to west.
17) vm22 mean south-north component of the surface to 2200 m MSL vector average wind (m/s). Positive for winds blowing from south to north, negative for winds blowing from north to south.
18) ut22 mean west-east component of the wind at the top of the atmospheric column at 2200 m MSL (m/s)
19) vt22 mean south-north component of the wind at the top of the atmospheric column at 2200 m MSL (m/s)
20) hx22 maximum reported relative humidity (%) in the 100 m AGL to 2200 m MSL layer
21) ci cloud index: broken, overcast or obscured cloud base below 3000 ft (0 for no, 1 for yes)
22) ptt0 potential temperature (K) at the surface
23) p0 surface pressure (hPa)
24) tsp total suspended particulate concentration (micrograms per cubic meter)
25) pm10 concentration (micrograms per cubic meter) of particulate matter smaller in aerodynamic diameter than 10 micrometers
26) pm25 concentration (micrograms per cubic meter) of particulate matter smaller in aerodynamic diameter than 2.5 micrometers
27) co carbon monoxide concentration (parts per million)
28) rad theoretical extraterrestrial daily total solar radiation (Watts per square meter)
29) snod snow depth (inches) measured at 1700 MST
30) mci daily cloud index: broken, overcast or obscured cloud base below 3000 ft on both the 0500 and 1700 MST observations (0 for no, 1 for yes)
31) co2s carbon dioxide concentration (ppm) at Sugarhouse
32) co2u carbon dioxide concentration (ppm) at the University of Utah
33) doe day of event (days); for multi-day episodes where h22 >= 4.04 MJ per meter squared, this is the day of the event. For example if the event lasts 4 days, this column will count up to 4, with 0.5 day resolution)

Note: The date/time group lists the sounding times at 0500 and 1700 MST, corresponding to 1200 and 0000 UTC. While these are the nominal times of the radiosonde launches, the sondes are actually launched about 45 minutes before these nominal times.

It was a multi-year effort putting this disparate data set together. If you use these data in published research we would appreciate an acknowledgment. Please keep us informed of any problems with the data set and check occasionally to see if we have added additional years or produced updates.

Contact information:

C. David Whiteman (dave.whiteman@utah.edu, 801-585-1414) and 
Sebastian W. Hoch (sebastian.hoch@utah.edu, 801-581-7094)
Department of Atmospheric Sciences
University of Utah
135 S 1460 E Rm 819
Salt Lake City, UT 84112-0110

Reference: 

Whiteman, C. D., S. W. Hoch, J. D. Horel, and A. Charland, 2014: Relationship between particulate air pollution and meteorological variables in Utah's Salt Lake Valley. Atmos. Environ., 94, 742-753.