POTENCIAL DE FORMAÇÃO DE OZÔNIO NA HOMOLOGAÇÃO VEICULAR NO BAIRRO DE BANGU, RIO DE JANEIRO

OZONE FORMING POTENTIAL FOR VEHICULAR HOMOLOGATION IN THE NEIGHBORHOOD OF BANGU, RIO DE JANEIRO

To control vehicle emissions, the new homologation process must be reported according to the California Maximum Incremental Reactivity (MIR) scale’s procedure to calculate the ozone forming potential (OFP) of each new vehicle. This work calculates an MIR scale suitable for the Brazilian reality. Meteorological and hourly pollutant data from the Bangu Automatic Air Quality Station was inventoried and processed from March to September 2020 to adjust OZIPR Lagrangean model and obtain the MIR scale by making small increments in the concentrations of each volatile organic compounds (VOC) and calculate the ozone increase/decrease. It was found that the VOC that had the greatest impact on ozone formation was 1,2,4-trimethylbenzene, with 2.06 ppb O₃ ppbC^-1 VOC. The OFP was calculated based on the VOC emissions of a vehicle and it was found a value of 9.421 mg O₃ km^-1, a much lower value when compared using the California MIR scale of 136.608 mg O₃ km^-1. It is concluded that meteorological conditions and VOC speciation data in the air mixture in the studied region directly affect the photochemical reactions of ozone formation.

Keywords:
ozone; troposphere; modeling; reactivity; emissions.