# The Air Quality Standards Regulations (Northern Ireland) 2010, Schedule 4: Long term objectives for ozone

Extent: N.I.

Objective
Averaging period
Long term objective
Date by which long term objective should be met
Protection of human health
Maximum daily eight hour mean within a calendar year
120 µg/m3
Not defined
Protection of vegetation
May to July
AOT 40 (calculated from 1h values) 6000 µg/m3.h.
Not defined

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Source: https://www.legislation.gov.uk/nisr/2010/188/schedule/4 (the official version)
Page: https://openlegislation.uk/air-quality-standards-regulations-northern-ireland-2010/schedule-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.