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IMPROVE**** Optical Data

The raw IMPROVE transmissometer and nephelometer data available in ASCII files.  See the Tools section for data processing tools and aggregation algorithm.

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WARNING!

The nephelometer and transmissometer data found on this website are preliminary, and have only undergone basic QA procedures.  There are known minor issues with both the nephelometer and transmissometer data sets, including the following:

 

  1. Some transmissometer Bext values are reported with no interference (validity code = 0), even though there is no corresponding RH value to determine whether RH interference flags should have been applied.  These values should be reported as ‘suspect’ (validity = 9).
  2. Validity codes other than those found in the transkey and nephkey documents (i.e. 5 and 8) occur in some older data.  Treat these observations as ‘suspect’.
  3. Small numbers of outlier Bext/Bsp data points occur at most sites.  These values are usually islands of Bext/Bsp values in between several interference-flagged observations.  The points are marked as ‘valid’, but should be used with caution.
  4. Zero values for transmissometers are inherently uncertain due to changes in lamp brightness and other factors.  Trends and discontinuities in low Bext values should be considered as having likely been caused by instrument related changes.
  5. Nephelometer Bsp values are generated by subtracting a fixed Rayleigh scattering value for each site from each scattering measurement.  The variability of actual ambient Rayleigh scattering coupled with the nephelometer’s inherent uncertainty will lead to frequent negative Bsp values that are valid.
  6. Many sites have anomalous temperature readings reported as valid which are clearly unrealistic.  Use caution when examining temperature effects.
  7. Relative humidity values before about 1993 are subject to significant uncertainty, and should be used with caution.  After about 1993, the RH measurements above about 95% still have significant uncertainty. In nephelometer data sets, many RH values greater than 100% are reported as valid.

 These issues are being addressed, and may be resolved in future data releases.

IMPROVE Network Metadata - Monitoring site information including site location, history, pictures, and air quality variables samples.

Nephelometer Data Description - Description of the data file formats and validity and inference codes for the nephelometer data

Nephelometer Location Table - ASCII table containing monitoring site location metadata for the nephelometer data

Transmissometer Data Description - Description of the data file formats and validity and inference codes for the Transmissometer data

Transmissometer Location Table - ASCII table containing monitoring site location metadata for the Transmissometer data

Go to FTP Site - The FTP site were the IMPROVE ASCII data files are stored

 

Nephelometer Data

(Click on the site location code to download its data in a PKzip file)
Location Site Name Lon (degrees) Lat (degrees) Elevation (m) Start Date End Date Sponsor
ACAD1 Acadia National Park -68.26 44.37 122 6/1/1995 2/28/1998 NPS
ACAD2 Acadia National Park -103.18 29.30 158 12/1/1997
NPS
BIBE1 Big Bend National Park -103.18 29.30 1052 12/1/1997
NPS
BOWA1 Boundary Waters Canoe Area -91.50 47.95 515 3/1/1993 11/30/1997 USFS
CORI1 Columbia River Gorge -121.00 45.66 198 9/1/1993
USFS
DOSO1 Dolly Sods /Otter Creek Wilderness -79.43 39.10 1175 3/1/1993 11/30/1997 USFS
EBFO1 Edwin B. Forsythe National Wildlife Refuge -74.45 39.47 5 3/1/1993 5/31/1994
GICL1 Gila Wilderness -108.23 33.22 1783 3/1/1994
USFS
GRGU1 Great Gulf Wilderness -71.22 44.31 439 6/1/1995
USFS
GRSM1 Great Smoky Mountains National Park -83.94 35.63 793 3/1/1993
NPS
HANC1 Hance Camp at Grand Canyon NP -111.99 35.97 2266 12/1/1997
NPS
JARB1 Jarbidge Wilderness -115.43 41.89 1889 3/1/1993 11/30/1997 USFS
LOPE1 Lone Peak Wilderness -111.71 40.44 1745 9/1/1993
USFS
LYBR1 Lye Brook Wilderness -73.13 43.14 1010 6/1/1993
USFS
MACA1 Mammoth Cave National Park -86.07 37.22 219 3/1/1993 8/31/1997 NPS
MACA2 Mammoth Cave National Park -86.15 37.13 236 6/1/1997
NPS
MORA1 Mount Rainier National Park -122.12 46.76 421 12/1/1992
NPS
MOZI2 Mount Zirkel Wilderness -106.68 40.54 3224 6/1/1994
USFS
MOZI1 Mount Zirkel Wilderness -106.74 40.46 3215 9/1/1993 7/16/1994 USFS
OKEF1 Okefenokee National Wildlife Refuge -82.13 30.74 47 12/1/1992 8/31/1997 FWS
SHEN1 Shenandoah National Park -78.43 38.52 1073 9/1/1996
NPS
SHRO1 Shining Rock Wilderness -82.77 35.38 1612 6/1/1994 9/21/1999 USFS
SNPA1 Snoqualamie Pass, Snoqualamie N.F -121.43 47.42 1152 9/1/1993
USFS
THSI1 Three Sisters Wilderness -122.04 44.29 881 9/1/1993
USFS
VIIS1 Virgin Islands National Park -64.79 18.33 46 3/1/1998
NPS
UPBU1 Upper Buffalo Wilderness -93.21 35.83 701 12/1/1992 11/30/1997 USFS

Transmissometer Data

(Click on the site location code to download its data in a PKzip file)

Location Site Name Receiver Transmitter Mean Elevation Elevation Angle (deg) Distance Start Date End Date Sponsor
Lon (deg) Lat (deg) Elevation (m) Bearing (deg) Lon (deg) Lat (deg) Elevation (m)
ACAD1 Acadia National Park -68.26 44.37 134 134 -68.23 44.35 466 300 5 4 9/1/1987 8/31/1993 NPS
BADL1 Badlands National Park -101.90 43.79 806 239 -101.95 43.77 805 805 -0.01 4.151 12/1/1987
NPS
BAND1 Bandelier National Monument -106.26 35.78 2011 315 -106.30 35.81 2143 2077 1.65 405776 9/1/1988
NPS
BIBE2 Big Bend National Park -103.21 29.39 1042 174 -103.21 29.34 1110 1076 0.83 4.7144 3/1/2000
NPS
BIBE1 Big Bend National Park -103.21 29.34 1082 353 -103.21 29.39 1033 1053 -0.59 4.735 12/1/1988
NPS
BRID1 Bridger Wilderness -109.79 42.93 2390 11 -109.77 42.97 2568 2479 2.01 5.0826 9/1/1988
USFS
CANY1 Canyonlands National Park -109.82 38.46 1806 73 -109.75 38.48 1774 1790 -0.29 6.4255 12/1/1986
NPS
CHIR2 Chiricahua National Monument -109.39 32.01 1567 97 -112.54 32.01 1682 1625 2.07 3.1801 12/1/1998
NPS
CHIR1 Chiricahua National Monument -109.39 32.01 1567 84 -109.32 32.01 2235 1901 6.26 6.1233 12/1/1988 2/28/1999 NPS
GLAC1 Glacier National Park -113.94 48.56 968 232 -113.99 48.53 975 972 0.08 5.2763 12/1/1988
NPS
GRBA1 Great Basin National Park -114.21 38.99 2130 315 -114.24 39.02 2365 2248 3.44 3.9134 9/1/1992
NPS
GRCA1 Hopi Point #1 -111.99 36.00 2256 81 -111.93 36.01 2170 2213 -0.85
12/1/1986
NPS
GRCW1 Grand Canyon National Park -112.12 36.07 2145 205 -112.09 36.11 755 1450 -15.78 5.1103 12/1/1989
NPS
GUMO1 Guadalupe Mountains National Park -104.81 31.83 1616 249 -104.86 31.82 1317 1467 -3.53 4.8583 12/1/1988
NPS
PEFO1 Petrified Forest National Park -109.77 35.08 1772 173 -109.75 34.94 1690 1731 -0.3 15.44 8/1/1987 8/31/1987 NPS
PEFO2 Petrified Forest National Park -109.80 34.90 1690 48 -109.75 34.95 1700 1695 0.1 5.9382 6/1/1987
NPS
PINN1 Pinnacles National Monument -121.15 36.47 448 317 -121.18 36.50 428 438 -0.25 4.7986 3/1/1988 8/31/1993 NPS
ROMO1 Rocky Mountain National Park -105.58 40.36 2535 305 -105.63 40.39 2932 2734 4.31 5.2745 12/1/1987 8/31/1997 NPS
ROMO2 Rocky Mountain National Park -105.58 40.37 2502 302 -105.63 40.39 2932 2717 5.01 4.9207 9/1/1998
NPS
SAGO1 San Gorgonio Wilderness -116.91 34.19 1710 211 -116.94 34.16 1731 1721 0.29 4.0993 3/1/1988
USFS
SHEN2 Shenandoah National Park -78.43 38.51 1073 310 -78.44 38.52 1061 1717 -0.49 1.4123 6/1/1991
NPS
TONT1 Tonto National Monument -111.03 33.62 733 115 -111.11 33.65 786 760 0.42 7.2025 3/1/1989 8/31/1991 USFS
YELL1 Yellowstone National Park -110.69 44.97 1836 125 -110.65 44.95 1951 1894 1.54 4.2847 6/1/1989 8/31/1993 NPS
YOSE2 Yosemite National Park -119.70 37.71 1608 236 -119.75 37.69 1475 1542 -1.71 4.4681 12/1/1994
NPS
YOSE1 Yosemite National Park -119.70 37.71 1608 242 -119.73 37.70 1370 1489 -5.04 2.7109 9/1/1988 11/30/1994 NPS