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Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below:

ISO 7996: 1985 Ambient air – determination of the mass concentrations of nitrogen oxides – chemiluminescence method M1.

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M1

Copies of these International Standards Organisation publications can be purchased from the British Standards Institution “BSI" sales department either by telephone on 020-8996-9001 or by post from the BSI, Standards House, 389 Chiswick High Road, London W4 4AL.