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A Ringelmann Chart is the series of shaded illustrations used to measure the opacity of air pollution emissions. The chart shades range from light grey to black and serve in the setting and enforcing of emission standards.

Source Publication:
Glossary of Environment Statistics, Studies in Methods, Series F, No. 67, United Nations, New York, 1997.

Statistical Theme: Environmental statistics

Created on Tuesday, September 25, 2001

Last updated on Wednesday, November 21, 2001