Division BAT 2: BAT is to monitor channelled emissions to air other than from process furnaces/heaters in accordance with EN standards and with at least the minimum frequency given in the table below. 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.

United Kingdom

Substance/Parameter	Processes/Sources	Standard(s)	Minimum monitoring frequency	Monitoring associated with
The monitoring applies where the pollutant is present in the waste gas based on the inventory of waste gas streams specified by the CWW BAT conclusions.
The minimum monitoring frequency for periodic measurements may be reduced to once every year, if the emission levels are proven to be sufficiently stable.
All (other) processes/sources where the pollutant is present in the waste gas based on the inventory of waste gas streams specified by the CWW BAT conclusions.
EN 15058 and the sampling period need adaptation so that the measured values are representative of the whole decoking cycle.
EN 13284-1 and the sampling period need adaptation so that the measured values are representative of the whole decoking cycle.
The monitoring applies where the chlorine and/or chlorinated compounds are present in the waste gas and thermal treatment is applied
Benzene	Waste gas from the cumene oxidation unit in phenol production^f1	No EN standard available	Once every month^f2	BAT 57
Benzene	All other processes/sources^f3	No EN standard available	Once every month^f2	BAT 10
Cl₂	TDI/MDI	No EN standard available	Once every month	BAT 66
Cl₂	EDC/VCM	No EN standard available	Once every month	BAT 76
CO	Thermal oxidiser	EN 15058	Once every month	BAT 13
	Lower olefins (decoking)	No EN standard available^f4	Once every year or once during decoking, if decoking is less frequent	BAT 20
	EDC/VCM (decoking)	No EN standard available^f4		BAT 78
Dust	Lower olefins (decoking)	No EN standard available^f5	Once every year or once during decoking, if decoking is less frequent	BAT 20
	EDC/VCM (decoking)	No EN standard available^f5		BAT 78
	All other processes/sources	EN 13284-1	Once every month	BAT 11
EDC	EDC/VCM	No EN standard available	Once every month	BAT 76
Ethylene oxide	Ethylene oxide and ethylene glycols	No EN standard available	Once every month	BAT 52
Formaldehyde	Formaldehyde	No EN standard available	Once every month	BAT 45
Gaseous chlorides, expressed as HCl	TDI/MDI	EN 1911	Once every month	BAT 66
	EDC/VCM			BAT 76
	All other processes/sources			BAT 12
NH₃	Use of SCR or SNCR	No EN standard available	Once every month	BAT 7
NO_X	Thermal oxidiser	EN 14792	Once every month	BAT 13
PCDD/F	TDI/MDI^f6	EN 1948-1, -2, and -3	Once every 6 months	BAT 67
PCDD/F	EDC/VCM	EN 1948-1, -2, and -3	Once every 6 months	BAT 77
SO₂	All processes/sources	EN 14791	Once every month	BAT 12
Tetrachloromethane	TDI/MDI	No EN standard available	Once every month	BAT 66
TVOC	TDI/MDI	EN 12619	Once every month	BAT 66
	EO (desorption of CO₂ from scrubbing medium)		Once every 6 months	BAT 51
	Formaldehyde		Once every month	BAT 45
	Waste gas from the cumene oxidation unit in phenol production	EN 12619	Once every month	BAT 57
	Waste gas from other sources in phenol production when not combined with other waste gas streams		Once every year	BAT 57
	Waste gas from the oxidation unit in hydrogen peroxide production		Once every month	BAT 86
	EDC/VCM		Once every month	BAT 76
	All other processes/sources		Once every month	BAT 10
VCM	EDC/VCM	No EN standard available	Once every month	BAT 76

Annotations

Footnotes

f1: The monitoring applies where the pollutant is present in the waste gas based on the inventory of waste gas streams specified by the CWW BAT conclusions.
f2: The minimum monitoring frequency for periodic measurements may be reduced to once every year, if the emission levels are proven to be sufficiently stable.
f3: All (other) processes/sources where the pollutant is present in the waste gas based on the inventory of waste gas streams specified by the CWW BAT conclusions.
f4: EN 15058 and the sampling period need adaptation so that the measured values are representative of the whole decoking cycle.
f5: EN 13284-1 and the sampling period need adaptation so that the measured values are representative of the whole decoking cycle.
f6: The monitoring applies where the chlorine and/or chlorinated compounds are present in the waste gas and thermal treatment is applied