Evaporative Emitters (EVAP)
According to USEPA vehicle emissions computer models, evaporative hydrocarbon emissions caused by liquid fuel leaks are similar in aggregate size to total tailpipe exhaust hydrocarbon emissions. However, most emissions inspection programs only test tailpipe emissions due to the time and expense of evaporative emissions testing. Therefore, they receive little if any USEPA emissions credit for reducing evaporative emissions and liquid leak emissions.
Remote Sensing Devices can identify the worst evaporative emitters, thereby providing a cost-effective and convenient emission reduction strategy. Evaporative-emitter candidates can be identified from the very same dataset collected for, and funded by, the popular clean screen application. In terms of overall hydrocarbon emissions inventory reductions, use of RSD to identify evaporative and liquid lead emissions can serve as a valuable tool while adding little, if any, additional cost once a clean screen program is already in place.