What is RSD?

Remote Sensing Devices or RSDs are specially designed emissions analyzers that are placed roadside, off the traveled surface, to measure individual vehicle emissions using low-intensity infrared and ultraviolet beams. RSDs collect emissions data as vehicles are driven in normal, everyday use without the need for the vehicle to stop or even slow down.

RSD’s measure concentrations of Carbon Monoxide (CO), Hydrocarbons (HC), Oxides and Dioxides of Nitrogen (NO and NO2) and Particulate Matter (PM) emitted in tailpipe exhaust.

RSDs also measure the evaporative hydrocarbon emissions caused by, for example, worn gas cap seals as well as the much larger liquid leaks from fuel lines, pumps, tanks and other components.

RSDs can measure these pollutant concentrations for all in-use vehicles and the data can be used to conveniently and effectively improve traditional station-based vehicle emission inspection programs. This same robust data set can also be used for a wide variety of other high value Data Applications such as spotting particular vehicle make/models that that pollute excessively due to design flaws or emissions control defeat devices.