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Characteristics of real-world gaseous exhaust emissions from cars in heterogeneous traffic conditions

Lookup NU author(s): Professor Margaret Carol Bell CBE, Dr Paul Goodman


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© 2021 Elsevier LtdIn this study, researchers have explored real-world driving conditions and developed emission factors for 58 passenger cars using on-board emission measurement technique while driving on five different routes in Delhi. The measured average emission factors of CO, HC, and NO were 3.99, 0.34, and 0.54 g/km for diesel vehicles, 7.26, 0.17, and 0.62 for petrol vehicles respectively. Road, traffic, vehicle type, and driving characteristics affect the quantity of emissions released. However, speed and acceleration significantly impact emission rates increasing with the increase in speed and acceleration. Also, emissions were minimal at 40–60 kmph and −0.5–0.5 m/s2. The estimated city-wide CO, HC, and NO emissions were 60.8, 4.8, and 9.72tonnes/day. These results demonstrate the importance of monitoring the real-world exhaust emissions given the substantial difference between test cycle measurements used for compliance testing of new vehicles.

Publication metadata

Author(s): Kuppili SK, Dheeraj Alshetty V, Diya M, Shiva Nagendra SM, Ramadurai G, Ramesh A, Gulia S, Namdeo A, Maji K, Bell M, Goodman P, Hayes E, Barnes J, Longhurst J, De Vito L

Publication type: Article

Publication status: Published

Journal: Transportation Research Part D: Transport and Environment

Year: 2021

Volume: 95

Print publication date: 01/06/2021

Online publication date: 30/04/2021

Acceptance date: 02/04/2018

ISSN (print): 1361-9209

ISSN (electronic): 1879-2340

Publisher: Elsevier Ltd


DOI: 10.1016/j.trd.2021.102855


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