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12. Rhaid llunio ansicrwydd (a fynegir ar gyfwng hyder o 95 %) y dulliau a ddefnyddir i asesu crynodiadau aer amgylchynol yn unol â'r “Arweiniad i Fynegi Ansicrwydd Mesuriadau” CEN (ENV 13005-1999)(1), y fethodoleg yn ISO 5725:1994, a'r arweiniad a roddir yn yr Adroddiad CEN, “Ansawdd aer — Agweddiad at amcangyfrif ansicrwydd ar gyfer dulliau mesuriad cyfeiriadol aer amgylchynol” (CR 14377:2002E). Mae'r canrannau ar gyfer ansicrwydd yn y tabl uchod wedi'u rhoi ar gyfer mesuriadau unigol, wedi'u cyfartaleddu dros y cyfnod ar gyfer cyfrifo amseroedd samplu nodweddiadol, ar gyfwng hyder o 95 %. Dylai' ansicrwydd y mesuriadau gael ei ddehongli fel pe bai'n gymwysadwy o gwmpas y gwerth targed priodol. Rhaid i'r mesuriadau sefydlog a dangosol gael eu dosbarthu'n gyfartal dros y flwyddyn er mwyn osgoi gogwyddo canlyniadau.
Cyhoeddiad y Pwyllgor Ewropeaidd ar Safoni (“CEN”), cyfeiriad CEN yw 36, Rue de Stassart, B-1050, Brwsel, Gwlad Belg http://www.cenorm.be
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