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Measurements of air pollutants over a Los Angeles freeway with a bistatic laser systemNitric oxide, ozone, and ethylene were monitored over roads during periods of heavy traffic by transmitting several known laser wavelengths over an atmospheric path and measuring the differential absorption of the wavelengths. Heavy afternoon traffic between four and five o'clock over a 3.75 km path produced a noticeable increase in ethylene and a decrease in ozone. The changes occurred on a short time scale and correlated with the sudden traffic density increase. The ozone decrease occurs because of the sudden presence of large quantities of nitric oxide. Although the laboratory laser equipment used is rather cumbersome, the measurements did point out the potential of the laser absorption technique for monitoring large areas from one location.-
Document ID
19760042980
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Menzies, R. T.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shumate, M. S.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Environment Pollution
Meeting Information
Meeting: International Conference on Environmental Sensing and Assessment
Location: Las Vegas, NV
Start Date: September 14, 1975
End Date: September 19, 1975
Accession Number
76A25946
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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