PART 1U.K.General

DefinitionsU.K.

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;

[F1“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;]

[F2“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;]

“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—

(a)

sulphur dioxide,

(b)

nitrogen dioxide,

(c)

oxides of nitrogen,

(d)

particulate matter,

(e)

lead,

(f)

benzene,

(g)

carbon monoxide,

(h)

arsenic,

(i)

cadmium,

(j)

mercury,

(k)

nickel,

(l)

benzo(a)pyrene or other polycyclic aromatic hydrocarbons,

(m)

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—

(a)

the Welsh Ministers for Wales;

(b)

the Scottish Ministers for Scotland; and

(c)

the Department of the Environment for Northern Ireland;

Textual Amendments