# Commission Regulation (EC) No 1737/2006 of 7 November 2006 laying down detailed rules for the implementation of Regulation (EC) No 2152/2003 of the European Parliament and of the Council concerning monitoring of forests and environmental interactions in the Community, Division (70): Scoring and definition for the percentage of symptomatic leaves on a branch with approximately 30 leaves

Extent: E+W+S+N.I.

0 No injury, none of the leaves injured.
1 1 %-5 % of the leaves show ozone symptoms
2 6 %-50 % of the leaves show ozone symptoms
3 51 %-100 % of leaves show ozone symptoms

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/15/division/11/division/70 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-15/division-11/division-70
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.