Air Quality Standards: DIRECTIVE 2008/50/EC, L 152/1, ANNEX XI, Limit Values for the Protection of Human Health: PM10 Limit values One day 50 µg/m3, not to be exceeded more than 35 times in a calendar year; Margin of tolerance: 50% Calendar year 40 µg/m3 Margin of tolerance: 50% PM2.5 Target/limit value Calender year 25 µg/m3   target value as of 2010; limit value as of 2015   The New Directive is introducing additional PM2.5 objectives targetting the exposure of the population to fine particles. These objectives are set at the national level and are based on the average exposure indicator AEI: this is determined as a 3-year running annual mean PM2.5 concentration averaged over the selected monitoring stations in agglomerations and larger urban areas, set in urban background locations to best assess the PM2.5 exposure to the general population. This New Directive includes the following key elements: that most of existing legislation be merged into a single directive (except for the fourth daughter directive) with no change to existing air quality objectives; Framework Directive 96/62/EC, 1-3 daughter Directives 1999/30/EC, 2000/69/EC, 2002/3/EC, and Decision on Exchange of Information 97/101/EC. New air quality objectives for PM2.5 (fine particles) including the limit value and exposure related objetives (exposure concentration obligation and exposure reduction target) the possibility to discount natural sources of pollution when assessing compliance against limit values possibility for time extensions of three years (PM10) or up to five years (NO2, benzene) for complying with limit values, based on conditions and the assessment by the European Commission. Legally binding in 2015 (years 2013,2014,2015) Title Metric Averaging period Legal nature Permitted exceedences each year PM2.5 Exposure concentration obligation 20 µg/m3 (AEI) Based on 3 year average n/a PM2.5 Exposure reduction target Percentage reduction *) + all measures to reach 18 µg/m3 (AEI) Based on 3 year average Reduction to be attained where possible in 2020, determined on the basis of the value of exposure indicator in 2010 n/a *) Depending on the value of AEI in 2010, a percentage reduction requirement (0,10,15, or 20%) is set in the Directive. If AEI in 2010 is assessed to be over 22 µg/m3, all appropriate measures need to be taken to achieve 18µµg/m3 by 2020. Criteria   for the validity of aggregated data and statistical parameters: Under EU law a limit value is legally binding from the date it enters into force subject to any exceedances permitted by the legislation. A target value is to be attained as far as possible by the attainment date and so is less strict than a limit value. 24-hour values 75% of the hourly averages (i.e., at least 18 hour values) Annual mean 90% of the one hour values or (if available) 24-hour values over the year Data coverage requirements do not include data losses due to regular calibration or the normal maintenance of the instrumentation. 2008/50/EC   Other relvant substance specific standards are summarized in the Table below: substance value unit period comments NO2 200 µg/m3 hourly not to be exceeded more than 18 time in a calendar year; limit value as of 2010 NO2 40 µg/m3 annual   PM10 50 µg/m3 daily not to be exceeded more than 35 times in a calendar year; limit value since 2005 PM10 40 µg/m3 annual limit value since 2005 PM2.5 25 µg/m3 annual target value as of 2010; limit value as of 2015 benzene 5 µg/m3 annual Limit value has entered into force 1.1.2010 cadmium 5 ng/m3 annual target value as of 2012 arsenic 6 ng/m3 annual target value as of 2012 nickel 20 ng/m3 annual target value as of 2012 BaP 1 ng/m3 annual target value as of 2012   PM3 Home Page PM3 SITE MAP PM3 Project Description Model System Implementation

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