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Bogota’s public transportation system has had dramatic changes in the last decade, but its fleet of 12,000 diesel buses is still one the main sources of fine particulate matter, affecting the health of its nearly 8 million inhabitants. Perhaps the most significant factor that explains the toxicity of particulate matter is particle number, rather than particulate mass. Therefore, developing strategies to reduce diesel engine particulate number emissions, and not only their mass, is one of the main purposes of Bogota’s environmental agency. Currently nanoparticle studies developed by Bogota’s environmental agency shows that the interval of 1.72 x 10 5 – 2.22 x 10 5 p cm -3 is the concentration in particle number inside the public transportation system’s buses one of the main ways of the city. This work aimed to measure particle number emissions from Euro II and Euro III buses under different load conditions on a chassis dynamome ter. The buses operate with diesel B2/B4 fuel with 50 mg/kg of sulfur (ASTM D-2622) and 0.01 g/100 g (ASTM D482) of ash. Two 50-passenger and four 160-passenger buses, the Euro II and Euro III, were tested. Particle counting and particle size distribution were determined using a NanoMet3 diffusion counter. Mass size distributions showed the same trend as number size distribution, but shifted in a proportion equal to the mass median diameter over median diameter

Diesel emissions from Euro II/III buses of Bogota’s urban transport system: the challenge is not reducing mass, but counting particles