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Study finds no sign of improvement in efforts to reduce smallest particles being emitted on busy London roadTechnologies to clean up traffic exhaust emissions may not be effective for some types of particle pollution, a study has found.If you stand at the edge of any major road, each cubic centimetre of air that you inhale will typically contain tens of thousands of tiny particles, far smaller than the wavelength of light. The small size of these ultrafine particles (UFPs) makes them impossible to see. They are also missed by conventional techniques that measure air pollution, they are not covered by the UK’s air pollution laws and the new study suggests they are evading systems installed in even the most modern vehicles. Continue reading...