Multi-angle lidar sensing of traffic aerosol in Manila

Maria Cecilia D. Galvez, Edgar A. Vallar, Eric B. Bangsal, Ernest P. Macalalad, Tanglaw A. Roman

Research output: Contribution to journalArticlepeer-review


Multi-angle lidar sensing of traffic aerosols was conducted in a very busy Manila area. The backscatter coefficients for 355 nm and 532 nm were calculated from Fernald's inversion method using calibration results retrieved from the slant-path method. An aerosol extinction-to-backscatter ratio of 30 sr was assumed in the calculation. Several scans were conducted on 31 July 2003 during peak traffic hours to observe the two-dimensional spatial and temporal distribution of traffic aerosols. The presence of a constant aerosol mass near a busy intersection was observed throughout the scanning period. The calculated backscatter coefficient for these aerosol mass ranged from 3.56×10 -6 m-1sr-1 to 5.01×10-6 m -1sr-1 for 532 nm and 1.76×10-5 m -1sr-1 to 2.02×10-5m-1sr -1 for 355 nm.

Original languageEnglish
Pages (from-to)545-548
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Publication statusPublished - Jun 2004
Externally publishedYes


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