[ZR08]
Air pollution with particulate matter
Assessments published: [ 2009 2013 2011 2008 ]
The indicator shows the number of days per year when the 24-hour limit concentration 50 µg/m3 and the annual limit value 40 µg/m3 were exceeded in the selected Slovenian urban areas that are most affected by pollution.

“Particulate matter” means a combination of finely divided solid or liquid particles suspended in the air, of various physical and chemical compositions.

A portion of airborne particles is formed as a consequence of direct emissions (primary particles), others are formed as products of various processes in the atmosphere (secondary particles).

Particle size distribution is usually described in terms of trimodal size distribution. Particles ranging between 0.01 and 0.1 µm belong in the so-called nucleation area, particles ranging between 0.1 and 1 µm belong in the accumulation area, and particles larger than 1 µm are known as coarse particles.

Image ZR8-1: Number of days with exceeded 24-hour limit concentration PM10 50 µg/m3, which may not be exceeded more than 35 times per calendar year

Source: National authomatic measurement air quality network database, Environmental Agency of the Republic of Slovenia, 2008


Image ZR8-2: Average annual concentration (annual limit value is 40 µg/m3)

Source: National authomatic measurement air quality network database, Environmental Agency of the Republic of Slovenia, 2008


Image ZR8-3: Gibanje povprečne letne koncentracije PM2.5 (letna mejna vrednost je 25 µg/m3)

Source: Zbirka podatkov avtomatskih meritev državne mreže za spremljanje kakovosti zraka (DMKZ), Agencija Republike Slovenije za okolje, 2009


In the Decree on Sulphur Dioxide, Nitrogen Oxides, Particulate Matter and Lead in Ambient Air (OJ RS No 52/02), Slovenian domestic legislation was brought in line with the provisions of the EU Directive (1999/30/EC), which determines the 24-hour limit concentration value at 50 µg/m3, which is not to be exceeded more than 35 times per calendar year, and annual limit value at 40 µg/m3.

Measurements of particlulate matter (PM10) concentration levels in several urban areas came into practice with the introduction of a new air quality monitoring network (i.e. PHARE monitoring network) in March 2001. As is clearly evident from Figure ZR8-1, particulate matter poses a serious problem not only in Slovenian urban areas but also throughout Europe. In 2002, 24-hour limit values were exceeded more than 35 times per calendar year at five monitoring sites. Since the latter are mainly placed in heavy traffic locations, emissions from traffic bear a significant influence on particulate matter concentration levels in ambient air.

The data for Slovenia are taken from the Automatic Air Quality Measurement Database (ANAS) managed by the Monitoring Office (Environmental Agency of the Republic of Slovenia). The database is updated monthly; the data are available in their entirety upon the completion of final annual review.

Following the Guidance to member states on PM10 monitoring and intercomparisons with reference method (14 September 2004) the PM10 concentration values for 2002 include factor 1.3.

Last update of indicator: 4 November 2008.

Apology: Texts in English haven't been updated yet.

Tanja Bolte, Environmental Agency of the Republic of Slovenia