Coefficient of haze explained

The coefficient of haze (also known as smoke shade) is a measurement of visibility interference in the atmosphere.

One way to measure this is to draw about 1000 cubic feet of air sample through an air filter and obtain the radiation intensity through the filter. The coefficient is then calculated based on the absorbance formula

COH = -100 log _{10} \left ( (I _{1})/(I _{0}) \right ) where I _{1} is the radiation (400 nm light) intensity transmitted through the sampled filter, and I _{0} is the radiation intensity transmitted through a clean (control) filter.

References

^{[1] [2]}

Further reading

• IUPAC Compendium of Chemical Terminology. 2nd. 1997. Coefficient of Haze. International Union of Pure and Applied Chemistry. http://goldbook.iupac.org/PDF/C01125.pdf. Alan D. McNaught and Andrew Wilkinson. 978-0-86542-684-9.
• Book: Methods of air sampling and analysis. James P. Lodge. 3rd. CRC Press. 1988. 9780873711418. Continuous Tape Sampling of Coefficient of Haze.

Notes and References

1. Dictionary of agricultural and allied sciences: (P), Part 7. L. L. Somani. Mittal Publications. 1992. 9788170991137. Coefficient of Haze. 322.
2. IUPAC Gold Book - coefficient of haze (COH) in atmospheric chemistry. 10.1351/goldbook.C01125 . 24 June 2013. free.