Detection of greenhouse gas precursors from ethanol powered vehicles in Brazil

• Using CO2 and Quantum Cascade Laser Photoacoustic Spectrometer, we could prove the presence of ethylene in the exhaust of ethanol vehicles for the first time.
• Photoacoustic technique has proven excellent requirements, such as selectivity, sensitivity, and portability for ethylene detection in the vehicles exhaust.
• Using electrochemical sensors, we could detect CO and NOx in ethanol powered vehicles in ppmV range.

The use of fossil fuels on the transport sector has caused the emission of various air pollutants, which can cause numerous damages to the atmosphere and to human health. In order to minimize pollutant emission, Brazilian government has encouraged the use of alternatives fuels, such as ethanol. Ethanol can be a great ally in global warming mitigation due to its potential to reduce carbon dioxide emissions in its renewable cycle.Otherwise, other pollutant gases emitted during ethanol combustion can contribute directly or indirectly to intensify global warming. In this study, Photoacoustic and Electrochemical sensors were used to detect greenhouse precursor gases, such as carbon monoxide, nitrogen oxides and especially ethylene, a primary pollutant in the generation of tropospheric ozone, in the exhaust of ethanol powered vehicles, in the range of ppmv.