European Metrology Programme for Innovation and Research Delivering Impact Improving inner city air quality Small particles from petrol and diesel engine exhausts create major hazards in city air, especially for those with asthma or other breathing problems. The EU’s Air Quality Directive requires monitoring of airborne pollution which is important for assessing the effectiveness of strategies such as London’s ultra- low emission zone. Ensuring the accuracy of instruments used for measuring vehicle particle emissions in city air relies on introducing standardised aerosols and testing regimes. Europe’s National Measurement Institutes working together The European Metrology Programme for Innovation and Research (EMPIR) has been developed as part of Horizon 2020, the EU Framework Pro

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