The National Climatic Data Center (NCDC) has, in archive, a number of copies of this historical publication dated between 1973 and 1991. The publication had several different titles during this period. The publication presents data produced from observational records submitted by stations in the World Meteorological Organization (WMO) Background Air Pollution Monitoring Network (BAPMoN), and ... includes data from additional cooperative stations. All issues include monthly tables of atmospheric turbidity. They present the daily average and minimum values for B (500 and 380 nanometers) and Alpha together with the number of observations each day. The daily Alpha value is the average for all observations taken that day. The monthly means for Alpha and Beta are computed from the monthly mean of all observed B values and also from the monthly mean of the published daily mean B values. Monthly data were initially presented for total precipitation and for 12 separate chemical analyses; pH, conductivity, sodium, potassium, magnesium, calcium, chloride, ammonium, nitrate, sulfate, acidity, and alkalinity in the 1972 issue. Selected daily atmospheric carbon dioxide (C02) flask sample measurements were added in the 1975 issue. Continuous CO2 measurements for Monte Cimone, Italy, and daily suspended particulate matter for Appelscha, Netherlands were added to the 1978 issue. The continuous CO2 results for 4 locations in the Federal Republic of Germany appeared for the first time in the 1979 report covering the years 1974 through 1979. Corrections were made to the 1977 data and these were added to the 1980 issue. Suspended particulate matter for three to five locations were presented in 1979.