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8.—(1) The percentage change in population exposure between the baseline period and the target date is to be measured by—
(a)determining, for each year from 2019 to 2040, the amount (in µg/m³) by which the Population Exposure Indicator for that year is greater or less than the Reference Indicator for that year;
(b)determining the sum of annual changes in population exposure between the baseline period and the target date, by adding together the amounts determined under sub-paragraph (a) for all years from 2019 to 2040; and
(c)expressing the sum of annual changes in population exposure, as represented by the amount determined under sub-paragraph (b), as a percentage of the Population Exposure Indicator for the baseline period, rounded to the nearest whole number.
(2) Schedule 1 specifies calculations which the Secretary of State is to carry out, for the purposes of enabling the determinations in paragraph (1) to be made and progress towards meeting the population exposure reduction target to be measured.
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