Boreal Laser's GasFinder is a portable open path gas monitor based on laser technology. GasFinder is uniquely suitable for studies of greenhouse gas emissions. It is specific to the gas of interest, provides one second response and has a broad dynamic range. GasFinder is permanently calibrated and is very small and light (less than 5kg). Alignment is easy and stable. No on-site electronic tuning is required, so a series of paths of different lengths (between 1m and 1000m) can be measured in quick succession. Consequently, GasFinder has been used in several greenhouse gas studies, both to establish baseline emissions and to determine the effectiveness of process improvements 10 reduce emissions. Examples presented in this paper include: CH_4 leak detection in the natural gas industry, CH_4 "hot-spot detection in landfills; NH_3 monitoring in agricultural operations; Co_2 emissions measurement; and emissions (esp. HF) monitoring in the aluminium industry. A multiple path version of GasFinder, GasFinder MC, that is ideally suited for permanent monitoring installations, is briefly described.
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