Abstract: Methods, systems, and computer program products for the fenceline monitoring of air contaminants. More particularly, methods, systems, and computer program products for correlating temporal variations between simultaneous measurements of at least one point monitor and an optical remote sensing (ORS) monitor to estimate the peak concentration of one or more air contaminants along a line of measurement, e.g., a fenceline.

Abstract: Path Integrated Optical Remote Sensing (PI-ORS) instruments are used to provide Path Integrated Concentration (PIC) data corresponding to a particulate concentration in region scanned by a sequence of optical beams. Prior art methods of developing spatial concentration maps using PIC data have required a relatively large number of intersecting beam paths. The present invention can produce spatial concentration maps using considerably fewer optical beams. Preferably, a non-overlapping radial beam geometry is used to produce PIC data that are processed to produce a spatial concentration map. The PIC data are indicative of the cumulative spatial concentration distribution of the contaminant in the sampling region. Once the PIC data are obtained, a specifically developed reconstruction algorithm is applied to the PIC data to create a map of concentration or contaminants or other constituents in the sampling region. Any of several different reconstruction algorithms can be employed.