# Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance), Division: BAT-AELs for emissions to air

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

Emission levels associated with the best available techniques (BAT-AELs) for emissions to air given in these BAT conclusions refer to concentrations, expressed as mass of emitted substance per volume of flue-gas under the following standard conditions: dry gas at a temperature of 273,15 K, and a pressure of 101,3 kPa, and expressed in the units mg/Nm3, μg/Nm3 or ng I-TEQ/Nm3.
The monitoring associated with the BAT-AELs for emissions to air is given in BAT 4
Reference conditions for oxygen used to express BAT-AELs in this document are shown in the table given below.
Activity
Reference oxygen level (OR)
Combustion of solid fuels
6 vol-%
Combustion of solid fuels in combination with liquid and/or gaseous fuels
Waste co-incineration
Combustion of liquid and/or gaseous fuels when not taking place in a gas turbine or an engine
3 vol-%
Combustion of liquid and/or gaseous fuels when taking place in a gas turbine or an engine
15 vol-%
Combustion in IGCC plants
The equation for calculating the emission concentration at the reference oxygen level is:
E R = 21 − O R 21 − O M × E M Where:
ER emission concentration at the reference oxygen level OR;
OR reference oxygen level in vol- %;
EM measured emission concentration;
OM measured oxygen level in vol- %.
For averaging periods, the following definitions apply:
For any parameter where, due to sampling or analytical limitations, 30-minute measurement is inappropriate, a suitable sampling period is employed. For PCDD/F, a sampling period of 6 to 8 hours is used.
Averaging period
Definition
Daily average
Average over a period of 24 hours of valid hourly averages obtained by continuous measurements
Yearly average
Average over a period of one year of valid hourly averages obtained by continuous measurements
Average over the sampling period
Average value of three consecutive measurements of at least 30 minutes each
Average of samples obtained during one year
Average of the values obtained during one year of the periodic measurements taken with the monitoring frequency set for each parameter

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/n4/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-n4/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.