# Commission Implementing Decision (EU) 2017/302 of 15 February 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the intensive rearing of poultry or pigs (notified under document C(2017) 688) (Text with EEA relevance), Division BAT 25

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

BAT is to monitor ammonia emissions to air using one of the following techniques with at least the frequency given below.
A description of the techniques is given in Section 4.9.2.
Technique
Frequency
Applicability
a
Estimation by using a mass balance based on the excretion and the total (or total ammoniacal) nitrogen present at each manure management stage.
Once every year for each animal category.
Generally applicable.
b
Calculation by measuring the ammonia concentration and the ventilation rate using ISO, national or international standard methods or other methods ensuring data of an equivalent scientific quality.
Every time there are significant changes to at least one of the following parameters:
(a) the type of livestock reared at the farm;
(b) the housing system.
Only applicable to emissions from each animal house.
Not applicable to plants with an air cleaning system installed. In this case, BAT 28 applies.
Due to the cost of measurements, this technique may not be generally applicable.
c
Estimation by using emission factors.
Once every year for each animal category.
Generally applicable.

---
Source: https://www.legislation.gov.uk/eudn/2017/302/annex/division/3/division/1/division/1.15/division/BAT+25 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-302/annex/division-3/division-1/division-1.15/division-BAT+25
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.