The Environment Agency's H4 odour guidance was replaced in December 2025 by a new online odour management hub. Here's what's changed for IAQM odour assessments in 2026 — including FIDOL, dispersion modelling, complaints risk and odour management plans.
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A comprehensive guide to the tools, training requirements and technologies used in professional odour assessments — from olfactometry and sniff testing to e-noses and dispersion modelling.
Unpleasant odours can cause complaints, disrupt communities, and lead to regulatory action. For industries that produce emissions or waste, an Odour Impact Assessment is essential.
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