Exhaust particle number and composition for diesel and gasoline passenger cars under transient driving conditions: Real-world emissions down to 1.5 nm

• DOI: 10.1016/j.envpol.2023.122645
• Publication Date: 2023-09-28T21:50:00Z
• Authors: Topi Rönkkö; Liisa Pirjola; Panu Karjalainen; Pauli Simonen; Kimmo Teinilä; Matthew Bloss; Laura Salo; Arindam Datta; Banwari Lal; Rakesh K. Hooda; Sanna Saarikoski; Hilkka Timonen
• Keywords: Particle (ecology); Trace gas; Ultrafine particle; Cold start (automotive)

Recent recommendations given by WHO include systematic measurements of ambient particle number concentration and black carbon (BC) concentrations. In India several other highly polluted areas, the air quality problems are severe need for related information is urgent. This study focuses on emissions BC passenger cars that technologically relevant from an Indian perspective. Particle were investigated under real-world conditions driving cycles typical urban environments. Two mobile laboratories advanced aerosol trace gas instrumentation utilized. Our shows without exhaust filtration can emit in large particles, especially at deceleration a significant fraction be even 1.2–10 nm sizes. The mass plume particles was dominated emitted acceleration conditions. However, contained also organic compounds, indicating roles engine oil fuel formation. general, our motivated serious problems, recognized lack emission to traffic, recent guidance; results emphasize importance monitoring concentrations areas traffic environments where people significantly exposed fresh emissions.