Diesel engines generally emit less CO2 than combustion engines, but they emit more nitrogen oxide and particulates. The danger to human health posed by these extremely small particulates has led to a significant reduction of regulatory limits on particulates emissions in the last decades. Tighter limits on particulates emissions translate into the need for increasingly sensitive detection methods to reliably determine the smallest quantities of particles. Gravimetric measurement has become the standard method of legal exhaust measurement and is the only method that offers both direct traceability and calibration.
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