Concentrations of particulate matter in ambient air

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Air pollution with PM₁₀ was the lowest in 2021 since we have been carrying out measurements. For the first time, at no monitoring site did the sum of exceeding the daily limit value for PM₁₀ (50 µg/m³) exceed the number of 35, which is allowed for the whole year. Even the annual limit value for PM₁₀in 2021 was not exceeded at any monitoring site. Despite the fact that in 2021 the permitted number of exceedances or the annual limit value for PM₁₀ particles was not exceeded at any monitoring site, high levels of PM₁₀are still measured, especially during the heating season in adverse weather conditions. Less polluted air with particles is the result of favorable meteorological conditions that prevailed in the winter period of the year. These allowes the dilution of emissions from small combustion plants and traffic, which are the main sources of PM₁₀ particles emissions in Slovenia. The annual limit value of 20 µg/m³ for PM_2,5 particles in 2021 was not exceeded at any of the five monitoring sites where we perform measurements. The average exposure KPI for PM_2,5 in 2021 was 14 µg/m³. The obligation regarding the level of exposure for 2021 amounts to 20 µg/m³.

Charts

Figure ZR08-1: Number of days with exceeded 24-hour limit concentration of 50 µg PM10/m3 (may not be exceeded more than 35 times per calendar year)

Sources:

National automatic measurement air quality network database, Environmental Agency of the Republic of Slovenia, database of complementary automated measurement networks (TE Šoštanj, TE-TO Ljubljana, EIS Anhovo, MO Ljubljana, MO Celje, MO Maribor, Občina Miklavž na Dravskem polju, Občina Ruše in MO Ptuj)

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	Urban-traffic type[]	Rural/Agricultural type[number of days]	Rural/Industrial type[number of days]	Urban background[number of days]	Suburban background[number of days]	Rural type/natural background[number of days]	permitted exceedance[number of days]
2005	111	40		68	65	5	35
2006	102	35.67		48	43	5	35
2007	95	27.67	17	38	35.33	0	35
2008	88	33.50	20	29.25	31	0	35
2009	67.67	25	15	24.60	24.33	5	35
2010	63	40.50	15.67	37.50	28.67	5	35
2011	77.67	60	36.67	48.44	34.67	3	35
2012	67.67	34.50	21.67	25.30	25.33	1	35
2013	52.67	20.50	15	23.73	14	0	35
2014	39.33	17.50	7.33	19.73	12.50	0	35
2015	63	23.50	7.67	33.36	14.75	0	35
2016	53.33	29.33	9.33	29.45	12.50	0	35
2017	41.50	33.33	7.33	29.17	20.50	3	35
2018	36	28	3.67	19	11.75	2	35
2019	26	19	4	11	5	2	35
2020	26	16	8	14	7	2	35
2021	19	12	6	8	3	1	35

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Figure ZR08-2: Average annual concentration of PM10 (annual limit value is 40 µg/m3)

Sources:

National automatic measurement air quality network database, Slovenian Environment Agency, database of complementary automated measurement networks, 2020 (Thermal power plant Šoštanj, TE-TO Thermal power plant Ljubljana, Environment Information System Anhovo, Municipality of Ljubljana, Municipality of Celje, Municipality of Maribor, Municipality of Miklavž in the Drava field, Municipality of Ruše, Municipality of Ptuj and Municipality of Grosuplje), 2021

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	Urban-traffic type[µg/m3]	Rural/Agricultural type[µg/m3]	Rural/Industrial type[µg/m3]	Rural type/natural background[µg/m3]	Urban background[µg/m3]	Suburban background[µg/m3]	annual limit value[µg/m3]	average annual concentration - total[µg/m3]
2005	46.67	32.50		16	39.75	35	40	34.15
2006	44.50	34		16	32.75	31.33	40	31.72
2007	40.50	31.50	23.50	15	31.50	27.33	40	28.22
2008	40.67	29.50	24	16	29	26.67	40	27.64
2009	38	30	21.50	16	27.40	26.33	40	26.54
2010	37	29.50	21.67	14	29.13	26.33	40	26.27
2011	38.33	33.50	26	17	29.89	26.67	40	28.56
2012	35.67	28.50	23.33	15	25.60	24.67	40	25.46
2013	33.33	25	20	13	23.91	20.50	40	22.62
2014	30.84	22.03	13.33	11	22.35	19.89	40	19.91
2015	33.33	25	21	13	26.36	21.50	40	23.37
2016	32	23.67	18.67	11	23.64	21	40	21.66
2017	29.50	26.33	19.33	12	24.25	22.50	40	22.32
2018	29	25.33	18	14	22.64	21	40	21.83
2019	26	23	17	11	20	18	40	19.23
2020	25	20	19	10	20	18	40	18.54
2021	24	20	17	9	19	16	40	17.58

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Figure ZR08-3: Average annual concentration of PM2,5 (annual limit value is 25 µg/m3)

Sources:

National automatic measurement air quality network database, Slovenian Environment Agency, 2020

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	Urban background[µg/m3]	Urban-traffic type[µg/m3]	Rural background[µg/m3]	annual limit value[µg/m3]
2005	28	28	15	25
2006	29	31	13	25
2007	25	27	10	25
2008	24	23	11	25
2009	19	22	12	25
2010	22	24	12	25
2011	24	26	14	25
2012	19.50	21	13	25
2013	20	22	11	25
2014	17.36	19.20	9.33	25
2015	21	21	10	25
2016	21	21	9	25
2017	19	20	10	25
2018	16.67	0	11	25
2019	14	0	8	25
2020	14.25	0	7	20
2021	13.75	0	7	20

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Figure ZR08-4: Average exposure indicator (AEI) for PM2.5(a three-calendaryear running annual mean concentration averaged over last three calendar year - exposure concentration obligation that need to be met by 2015 is 20 µg/m3)

Sources:

National automatic measurement air quality network database (DKMZ), Slovenian Environment Agency, 2020

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