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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

oscillating microbalance

Language : PIARC Road Dictionary / English
Theme : Environment Environmental Protection
Definition : Measuring device which measures the concentration by mass of ultrafine particles suspended in the air by analysing the oscillations of a filter they have to pass through, and which vibrates under the effect of a constant electric field with a frequency that decreases as the mass of particles accumulating in it increases [OQLF/PIARC].