Table 1.

Summary of temporal and spatial characteristics of datasets used.

Data Source	Data Type	Latitude (°)	Longitude (°)	Altitude (m AMSL)	Date Range
NCDC: Tehran Mehrabad	Met/Visibility	35.68	51.32	1191	1/1/2000–12/31/2009
NCDC: Semnan	Met/Visibility	35.55	53.38	1131	1/4/2000–12/31/2009
NCDC: Gharakhil	Met/Visibility	36.45	52.82	14	1/25/2000–12/31/2009
NCDC: Mehrabad	Radiosonde	35.68	51.32	1191	1/1/1980–12/31/2012
MODIS TERRA	Deep Blue AOD, Cloud Fraction	35–36	51–52	N/A	3/1/2000–12/31/2009
MODIS AQUA	Deep Blue AOD, Cloud Fraction	35–36	51–52	N/A	7/4/2002–12/31/2009
MODIS	FIRMS	20–55	20–70	N/A	3/1/2000–12/31/2009
MISR	AOD	35–36	51–52	N/A	2/25/2000–12/31/2009
TOMS	UV Aerosol Index	35–36	51.25–52.5	N/A	2/24/2000–12/14/2005
OMI	UV Aerosol Index	35–36	51–52	N/A	2/24/2000–12/14/2005
GOCART	Speciated AOD	34–36	50–52.5	N/A	2/24/2000–12/31/2007
HYSPLIT	Back-trajectories	35.7	51.42	500, 1000, 3000	1/1/2000–12/31/2009
MERRA	Gridded Reanalysis	35.5–36.5	51.33–52.67	N/A	1/1/2001–12/31/2009