Changes for page 5.1 Number of days during which air quality parameters exceed threshold values

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1		-XWiki.hyunjicho
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1		-= 5.1 Number of days during which air quality parameters exceed threshold values =
	1	+= 5.1 Number of days during which air quality parameters exceed threshold values =
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3	3	Project Name: UNaLab
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36	36	* Particulate matter (PM10 and PM2.5) concentration
37	37	* Nitrogen dioxide (NO2) concentration
	38	+* Sulfur dioxide (SO2) concentration
38	38	* Ground-level ozone (O3) concentration
39	39	* Carbon monoxide (CO) concentration
40	40	* Polycyclic aromatic hydrocarbon (PAH) concentration
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50	50	* Air pollution concentrations for regulatory compliance are based on measured pollutant concentrations (PM10 and PM2.5, O3, NO2, SO2, CO and PAHs) in ambient air. To assess differences in air quality as a result of NBS implementation, air quality monitoring should be conducted in close proximity to the NBS of interest and at an analogous reference site.
51	51	* **Particulate matter (PM10 and PM2.5) concentration:** The reference method for the sampling and measurement of PM2.5 and PM10 is described in EN12341:2014 “Ambient Air — standard gravimetric measurement method for the determination of the PM10 or PM2,5 mass concentration of suspended particulate matter”. Briefly, particulate matter is measured using an air sampler that draws ambient air at a constant flow rate through a specially shaped inlet onto a filter that is weighed periodically to measure the accumulated particle load. The inlet defines the particle size cut-off (2.5 or 10 µm). A stationary measuring station is placed in a representative traffic, urban, industrial or rural location and continuous measurement of particulate matter using standardized air sampler equipment is undertaken. The limit concentration for PM2.5 is 25 µg/m3 averaged over one calendar year. Similarly, the limit concentration for PM10 is 40 µg/m3 averaged over one year. To obtain these values, daily PM2.5 and PM10 averages are averaged over a year to reach a yearly average, which acts as the indicator (ISO, 2018). There is an additional daily average limit value for PM10 of 50 µg/m3, which cannot be exceeded more than 35 times in a calendar year.
52	52	* **Nitrogen dioxide (NO2) concentration**: The reference method for the measurement of nitrogen dioxide and oxides of nitrogen is that described in EN 14211:2012 “Ambient air — Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence”. To quantify nitrogen dioxide, a stationary measuring station is placed in a representative traffic, urban, industrial or rural location and continuous measurement of nitrogen dioxide is undertaken using standardized chemiluminescence detection equipment. An average of hourly averages is used to calculate a daily average. Daily averages are then used to calculate a yearly average (ISO, 2018). The limit concentration for NO2 is 200 µg/m3 in any one-hour time period, and 40 µg/m3 averaged over one year.
	54	+* **Sulfur dioxide (SO2) concentration:** The reference method for the measurement of sulphur dioxide is described in EN 14212:2012 “Ambient air — Standard method for the measurement of the concentration of sulphur dioxide by ultraviolet fluorescence”. To quantify sulfur dioxide, a stationary measuring station is placed in a representative traffic, urban, industrial or rural location and continuous measurement of nitrogen dioxide is undertaken using ultraviolet fluorescence detection equipment. An average of hourly averages is used to calculate a daily average. Daily averages are used to calculate a yearly average (ISO, 2018). The limit concentration for SO2 is 350 µg/m3 in any one-hour time period and 125 µg/m3 averaged over one day.
53	53	* **Ground-level ozone (O3) concentration: **The reference method for the measurement of ozone is described in EN 14625:2012 “Ambient air — Standard method for the measurement of the concentration of ozone by ultraviolet photometry”. A stationary measuring station is placed in a representative traffic, urban, industrial or rural location and continuous measurement of ozone by ultraviolet photometry using standardized equipment is undertaken. The convention for ozone measurement is to calculate a daily maximum 8-hour mean (ISO, 2018). The limit concentration for maximum daily 8-hour mean ground-level O3 is 120 µg/m3.
54	54	* **Carbon monoxide (CO) concentration: **The reference method for the measurement of carbon monoxide is described in EN 14626:2012 “Ambient air — Standard method for the measurement of the concentration of carbon monoxide by non dispersive infrared spectroscopy”. A stationary measuring station is placed in a representative traffic, urban, industrial or rural location and continuous measurement of CO using non-dispersive infrared spectroscopy equipment is undertaken. Like O3, the convention for CO measurement is to calculate a daily maximum 8-hour mean (ISO, 2018). The limit concentration for maximum daily 8-hour mean CO is 10 µg/m3.
55	55	* **Polycyclic aromatic hydrocarbon (PAH) concentration: **The reference method for the sampling of polycyclic aromatic hydrocarbons in ambient air is described in EN 12341:2014. The PAH benzo(a)pyrene (BaP) serves as an analogue for all PAHs in the European air quality regulations. To assess the contribution of BaP in ambient air, the Ambient Air Quality Directive (2004/107/EC) outlines an obligation for Member States to monitor other relevant PAHs at a limited number of measurement sites including at least: benzo(a)anthracene, benzo(b)fluoranthene, benzo(j)fluoranthene, benzo(k)fluoranthene, indeno(1,2,3-cd)pyrene, and dibenz(a,h)anthracene. The reference method for the measurement of benzo(a)pyrene in ambient air is described in EN 15549:2008 “Air quality — Standard method for the measurement of concentration of benzo[a]pyrene in ambient air”. Briefly, benzo(a)pyrene (BaP) is analysed as part of the captured PM10 matter. BaP samples are extracted from captured PM10 then analysed by high performance liquid chromatography (HPLC) with fluorescence detection (FLD) or by gas chromatography with mass spectrometric detection (GC/MS). The target value for BaP is 1 ng/m3 averaged over one calendar year.
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57	57	Summary list of ambient air quality pollutants and limit concentrations.
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59	59	[[image:1642527289618-461.png]]