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RDE regulation in Brazil for Light Duty Vehicles will be made effective after Jan/2022. Brazil has some specific conditions and it is necessary to adapt the European RDE procedure in order to attend them: ozone as main pollutant, more than half LDV fleet are flexfuel, able to burn gasoline and ethanol biofuel but with high VOC emission, main big cities altitude close to 1,000 m and high road grade and type approval laboratory cycle based on FTP-75. The objective of this paper is to share advances and concerns about the work of Brazilian specialists in RDE Brazil procedure development. Some changes have already been introduced in the RDE procedure, but some concerns are coming to light, as the correct representativeness of FTP-75 as reference cycle, high ethanol emission at cold start below 20°C, tendency to high hydrocarbon and CO emission when driving at high positive altitude gain and temperatures higher than 30°C.

It is common the development of greenhouse gas (GHG) emissions inventories, by private and public organizations. They are used as starting point for policy makers in their efforts on the mitigation of greenhouse gas emissions. It has already been established that vehicle emissions contain methane (CH4), whose formation is strongly dependent on the type of emission control system used. In the transportation sector, methane emission can contribute significantly to the total GHG emissions, considering the lifecycle of the fuel used. Although there are plenty of data about the regulated emission from vehicles, for greenhouse gases such data tend to be scarce. For this reason it is usual to try to establish ratios between the regulated pollutants and greenhouse gases so that the latter can be estimated from the available data of the former. The most usual way to do that is to make such estimation based on a relation between CH4 and NMVOC (non-methane volatile organic compounds).