# 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 4: BAT is to monitor emissions to air with at least the frequency given below and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality. Extent: E+W+S+N.I. Generic EN standards for continuous measurements are EN 15267-1, EN 15267-2, EN 15267-3, and EN 14181. EN standards for periodic measurements are given in the table. The monitoring frequency does not apply where plant operation would be for the sole purpose of performing an emission measurement. In the case of plants with a rated thermal input of < 100 MW operated < 1 500 h/yr, the minimum monitoring frequency may be at least once every six months. For gas turbines, periodic monitoring is carried out with a combustion plant load of > 70 %. For co-incineration of waste with coal, lignite, solid biomass and/or peat, the monitoring frequency needs to also take into account Part 6 of Annex VI to the IED. In the case of use of SCR, the minimum monitoring frequency may be at least once every year, if the emission levels are proven to be sufficiently stable. In the case of natural-gas-fired turbines with a rated thermal input of < 100 MW operated < 1 500 h/yr, or in the case of existing OCGTs, PEMS may be used instead. PEMS may be used instead. Two sets of measurements are carried out, one with the plant operated at loads of > 70 % and the other one at loads of < 70 %. As an alternative to the continuous measurement in the case of plants combusting oil with a known sulphur content and where there is no flue-gas desulphurisation system, periodic measurements at least once every three months and/or other procedures ensuring the provision of data of an equivalent scientific quality may be used to determine the SO2 emissions. In the case of process fuels from the chemical industry, the monitoring frequency may be adjusted for plants of < 100 MWth after an initial characterisation of the fuel (see BAT 5) based on an assessment of the relevance of pollutant releases (e.g. concentration in fuel, flue-gas treatment employed) in the emissions to air, but in any case at least each time that a change of the fuel characteristics may have an impact on the emissions. If the emission levels are proven to be sufficiently stable, periodic measurements may be carried out each time that a change of the fuel and/or waste characteristics may have an impact on the emissions, but in any case at least once every year. For co-incineration of waste with coal, lignite, solid biomass and/or peat, the monitoring frequency needs to also take into account Part 6 of Annex VI to the IED. In the case of process fuels from the chemical industry, the monitoring frequency may be adjusted after an initial characterisation of the fuel (see BAT 5) based on an assessment of the relevance of pollutant releases (e.g. concentration in fuel, flue-gas treatment employed) in the emissions to air, but in any case at least each time that a change of the fuel characteristics may have an impact on the emissions. In the case of plants with a rated thermal input of < 100 MW operated < 500 h/yr, the minimum monitoring frequency may be at least once every year. In the case of plants with a rated thermal input of < 100 MW operated between 500 h/yr and 1 500 h/yr, the monitoring frequency may be reduced to at least once every six months. If the emission levels are proven to be sufficiently stable, periodic measurements may be carried out each time that a change of the fuel and/or waste characteristics may have an impact on the emissions, but in any case at least once every six months. In the case of plants combusting iron and steel process gases, the minimum monitoring frequency may be at least once every six months if the emission levels are proven to be sufficiently stable. The list of pollutants monitored and the monitoring frequency may be adjusted after an initial characterisation of the fuel (see BAT 5) based on an assessment of the relevance of pollutant releases (e.g. concentration in fuel, flue-gas treatment employed) in the emissions to air, but in any case at least each time that a change of the fuel characteristics may have an impact on the emissions. In the case of plants operated < 1 500 h/yr, the minimum monitoring frequency may be at least once every six months. In the case of plants operated < 1 500 h/yr, the minimum monitoring frequency may be at least once every year. Continuous sampling combined with frequent analysis of time-integrated samples, e.g. by a standardised sorbent trap monitoring method, may be used as an alternative to continuous measurements. If the emission levels are proven to be sufficiently stable due to the low mercury content in the fuel, periodic measurements may be carried out only each time that a change of the fuel characteristics may have an impact on the emissions. The minimum monitoring frequency does not apply in the case of plants operated < 1 500 h/yr. Measurements are carried out with the plant operated at loads of > 70 %. In the case of process fuels from the chemical industry, monitoring is only applicable when the fuels contain chlorinated substances. Substance/Parameter Fuel/Process/Type of combustion plant Combustion plant total rated thermal input Standard(s) Minimum monitoring frequency Monitoring associated with NH3 When SCR and/or SNCR is used All sizes Generic EN standards Continuous BAT 7 NOX Coal and/or lignite including waste co-incineration Solid biomass and/or peat including waste co-incineration HFO- and/or gas-oil-fired boilers and engines Gas-oil-fired gas turbines Natural-gas-fired boilers, engines, and turbines Iron and steel process gases Process fuels from the chemical industry IGCC plants All sizes Generic EN standards Continuous BAT 20 BAT 24 BAT 28 BAT 32 BAT 37 BAT 41 BAT 42 BAT 43 BAT 47 BAT 48 BAT 56 BAT 64 BAT 65 BAT 73 Combustion plants on offshore platforms All sizes EN 14792 Once every year BAT 53 N2O Coal and/or lignite in circulating fluidised bed boilers Solid biomass and/or peat in circulating fluidised bed boilers All sizes EN 21258 Once every year BAT 20 BAT 24 CO Coal and/or lignite including waste co-incineration Solid biomass and/or peat including waste co-incineration HFO- and/or gas-oil-fired boilers and engines Gas-oil-fired gas turbines Natural-gas-fired boilers, engines, and turbines Iron and steel process gases Process fuels from the chemical industry IGCC plants All sizes Generic EN standards Continuous BAT 20 BAT 24 BAT 28 BAT 33 BAT 38 BAT 44 BAT 49 BAT 56 BAT 64 BAT 65 BAT 73 Combustion plants on offshore platforms All sizes EN 15058 Once every year BAT 54 SO2 Coal and/or lignite including waste co-incineration Solid biomass and/or peat including waste co-incineration HFO- and/or gas-oil-fired boilers HFO- and/or gas-oil-fired engines Gas-oil-fired gas turbines Iron and steel process gases Process fuels from the chemical industry in boilers IGCC plants All sizes Generic EN standards and EN 14791 Continuous BAT 21 BAT 25 BAT 29 BAT 34 BAT 39 BAT 50 BAT 57 BAT 66 BAT 67 BAT 74 SO3 When SCR is used All sizes No EN standard available Once every year — Gaseous chlorides, expressed as HCl Coal and/or lignite Process fuels from the chemical industry in boilers All sizes EN 1911 Once every three months BAT 21 BAT 57 Solid biomass and/or peat All sizes Generic EN standards Continuous BAT 25 Waste co-incineration All sizes Generic EN standards Continuous BAT 66 BAT 67 HF Coal and/or lignite Process fuels from the chemical industry in boilers All sizes No EN standard available Once every three months BAT 21 BAT 57 Solid biomass and/or peat All sizes No EN standard available Once every year BAT 25 Waste co-incineration All sizes Generic EN standards Continuous BAT 66 BAT 67 Dust Coal and/or lignite Solid biomass and/or peat HFO- and/or gas-oil-fired boilers Iron and steel process gases Process fuels from the chemical industry in boilers IGCC plants HFO- and/or gas-oil-fired engines Gas-oil-fired gas turbines All sizes Generic EN standards and EN 13284-1 and EN 13284-2 Continuous BAT 22 BAT 26 BAT 30 BAT 35 BAT 39 BAT 51 BAT 58 BAT 75 Waste co-incineration All sizes Generic EN standards and EN 13284-2 Continuous BAT 68 BAT 69 Metals and metalloids except mercury (As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sb, Se, Tl, V, Zn) Coal and/or lignite Solid biomass and/or peat HFO- and/or gas-oil-fired boilers and engines All sizes EN 14385 Once every year BAT 22 BAT 26 BAT 30 Waste co-incineration < 300 MWth EN 14385 Once every six months BAT 68 BAT 69 ≥ 300 MWth EN 14385 Once every three months IGCC plants ≥ 100 MWth EN 14385 Once every year BAT 75 Hg Coal and/or lignite including waste co-incineration < 300 MWth EN 13211 Once every three months BAT 23 ≥ 300 MWth Generic EN standards and EN 14884 Continuous Solid biomass and/or peat All sizes EN 13211 Once every year BAT 27 Waste co-incineration with solid biomass and/or peat All sizes EN 13211 Once every three months BAT 70 IGCC plants ≥ 100 MWth EN 13211 Once every year BAT 75 TVOC HFO- and/or gas-oil-fired engines Process fuels from the chemical industry in boilers All sizes EN 12619 Once every six months BAT 33 BAT 59 Waste co-incineration with coal, lignite, solid biomass and/or peat All sizes Generic EN standards Continuous BAT 71 Formaldehyde Natural-gas in spark-ignited lean-burn gas and dual fuel engines All sizes No EN standard available Once every year BAT 45 CH4 Natural-gas-fired engines All sizes EN ISO 25139 Once every year BAT 45 PCDD/F Process fuels from the chemical industry in boilers Waste co-incineration All sizes EN 1948-1, EN 1948-2, EN 1948-3 Once every six months BAT 59 BAT 71 --- Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/1/division/1.2/division/3 (the official version) Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-1/division-1.2/division-3 Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.