Monitoring Area Emissions

Measuring the concentration of air pollutants in a large area presents different problems. The potential sources of these emissions are many. For example, VOCs are emitted from hazardous waste sites; organic and inorganic gases are emitted from landfills, lagoons, storage piles, and spill sites. Area emissions can be measured either directly

Cut Away to Show Sweep Air Inlet Line and the Outlet Line

FIG. 5.9.6 Cutaway diagram of the emission isolation flux chamber and support equipment. (Reprinted, with permission, from J.C. Harris, C.E. Rechsteiner, and K.E. Thrun, 1984, Sampling and analysis methods for hazardous waste combustion, EPA-600/8-84/002, PB 84-155545, U.S. EPA [February].)

Cut Away to Show Sweep Air Inlet Line and the Outlet Line

FIG. 5.9.6 Cutaway diagram of the emission isolation flux chamber and support equipment. (Reprinted, with permission, from J.C. Harris, C.E. Rechsteiner, and K.E. Thrun, 1984, Sampling and analysis methods for hazardous waste combustion, EPA-600/8-84/002, PB 84-155545, U.S. EPA [February].)

or indirectly. In direct measurements, ambient air is sampled at various points in the area of emission. Indirect methods sample ambient air at points upwind and downwind of the emission.

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