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2. In these Regulations—
“ambient air” means outdoor air in the troposphere, excluding workplaces where members of the public do not have regular access;
“AOT 40” (expressed in (μg/m3)∙ hours) means the sum of the difference between hourly concentrations greater than 80 μg/m3 (=40 parts per billion) and 80 μg/m3 over a given period using only the one-hour values measured between 08.00 hours and 20.00 hours Central European Time (CET) each day;
“arsenic”, “cadmium”, “nickel” and “benzo(a)pyrene” mean the total content of those elements and compounds within the PM10 present in ambient air;
“Directive 2008/50/EC” means Directive 2008/50/EC of the European Parliament and of the Council on ambient air quality and cleaner air for Europe(1);
“Directive 2004/107/EC” means Directive 2004/107/EC of the European Parliament and of the Council relating to arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons in ambient air(2);
“fixed measurements” means measurements taken at fixed locations, either continuously or by sampling from time to time, to determine levels of pollutants in accordance with the relevant data quality objectives;
“indicative measurement” means measurements which meet data quality objectives that are less strict than those required for fixed measurements;
“margin of tolerance” means the percentage of the limit value by which that value may be exceeded in a given year;
“oxides of nitrogen” means the sum of the volume mixing ratio (ppbv) of nitrogen monoxide (nitric oxide) and nitrogen dioxide expressed in units of mass concentration of nitrogen dioxide (μg/m3);
“ozone precursor substances” means substances which contribute to the formation of ground level ozone;
“PM10” means particulate matter which passes through a size-selective inlet as defined in the reference method for the sampling and measurement of PM10, EN 12341, with a 50% efficiency cut-off at 10 μm aerodynamic diameter;
“PM2.5” means particulate matter which passes through a size-selective inlet as defined in the reference method for the sampling and measurement of PM2.5, EN 14907, with a 50% efficiency cut-off at 2.5μm aerodynamic diameter;
“particulate matter” means PM2.5 and PM10;
“pollutant” means any of the following—
sulphur dioxide,
nitrogen dioxide,
oxides of nitrogen,
particulate matter,
lead,
benzene,
carbon monoxide,
arsenic,
cadmium,
mercury,
nickel,
benzo(a)pyrene or other polycyclic aromatic hydrocarbons,
ozone;
“polycyclic aromatic hydrocarbons” means those organic compounds composed of at least two fused aromatic rings made entirely from carbon and hydrogen;
“relevant administration” means—
the Welsh Ministers for Wales;
the Scottish Ministers for Scotland; and
the Department of the Environment for Northern Ireland;
OJ No 152, 11.6.2008, p. 1
OJ No 23, 26.1.2005, p. 3, last amended by Regulation (EC) No 219/2009 (OJ No L 87, 31.3.2009, p 109)
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