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6702047 
Journal Article 
REAL-WORLD EMISSION FACTORS OF CARBONYL COMPOUNDS MEASURED IN A RIO DE JANEIRO TUNNEL, BRAZIL 
Souza Almeida, JC; Do Prado Braga, AL; Bastos, L; Arbilla, G; Martins, EM; , 
2020 
1 
Química Nova
ISSN: 0100-4042
EISSN: 1678-7064 
SOC BRASILEIRA QUIMICA 
SAO PAULO 
43 
4 
455-462 
Portuguese 
WOS:000540708100010 
Real-world vehicle emissions of carbonyls compounds (CC) were determined at the Reboucas Tunnel, Rio de Janeiro (Brazil). The tunnel is a two-bore tunnel with three lanes in each direction and has a length of 2840 m, divided in two sections. On average, approximately 5,000 vehicles (95% light duty) were passing the tunnel per hour. Sixteen samples were simultaneously collected 500 and 1500 m inside from the entrance. The main CC were formaldehyde, acetaldehyde, acetone, propionaldehyde and benzaldehyde. A total of 16 samples were collected in each point in 8 different days. In 5 days, CO and CO2 were also monitored during the sampling period. Emission factors were calculated. Using the Pierson method, emission factors were 7.5 +/- 2.6 and 13.8 +/- 5.7 mg km(-1) for formaldehyde and acetaldehyde, respectively. Using the fuel consumption method, values were 6.3 +/- 2.1 and 11.8 +/- 3.9 mg km(-1) for the same compounds. The differences between both methods were lower than 20% and may be considered acceptable considering all the approximations in the calculations. Ozone forming potentials (OFP) were also estimated as 90.4 +/- 37.3 and 70.7 +/- 24.6 mg km(-1) for formaldehyde and acetaldehyde, respectively. 
emission factor; tunnel; carbonyl compounds 
QUIMICA NOVA