Nitrogen dioxide - Hourly limit value for the protection of human health
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Created 10 Dec 2012
Published 10 Dec 2012
Last modified 11 Sep 2015
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In the air quality directive (2008/EC/50), the EU has set two limit values for nitrogen dioxide (NO2) for the protection of human health: the NO2 hourly mean value may not exceed 200 micrograms per cubic metre (µg/m3) more than 18 times in a year and the NO2 annual mean value may not exceed 40 micrograms per cubic metre (µg/m3). These limit values come into force for concentrations measured from 1.1.2010 so during 2009 a margin of tolerance equal to an annual mean value of 42 micrograms per cubic metre (μg/m3) is still in place
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For references, please go to https://www.eea.europa.eu/data-and-maps/figures/nitrogen-dioxide-hourly-limit-value-for-the-protection-of-human-health-4 or scan the QR code.
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