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The Air Quality Standards (Wales) Regulations 2007

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PART 2Margins of tolerance for benzene and nitrogen dioxide

Start of period during which the margin appliesEnd of period during which the margin appliesBenzeneNitrogen dioxide (hourly limit value for the protection of human health)Nitrogen dioxide (annual limit value for the protection of human health)
Coming into force of these Regulations31 December 20073 μg/m330 μg/m36 μg/m3
1 January 200831 December 20082 μg/m320 μg/m34 μg/m3
1 January 200931 December 20091 μg/m310 μg/m32 μg/m3

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