Residents living near waste treatment plants often endure persistent foul odours that go beyond mere discomfort. Elaine Corner, a retired teacher from Westbury, describes the stench from a nearby facility as 'walking behind an open bin lorry', causing nausea and preventing her from using her garden. Her experience highlights a growing concern about the health impacts of odour pollution, which researchers say can have both immediate and long-term effects on wellbeing.
Smell evolved as an early-warning system to detect danger, according to Johan Lundström, a professor at the Karolinska Institute in Stockholm. The brain processes odour signals within 300 milliseconds, triggering rapid avoidance responses. Studies show that even pleasant smells can become negative when associated with threat, and sensitivity to certain odours increases dramatically when paired with a negative stimulus, such as an electric shock.
Beyond threat detection, malodours can directly affect health. A 2021 review found 'biological plausibility' for symptoms like headaches, nausea, and respiratory difficulties linked to bad smells. The vagus nerve, connecting brain and gut, can be triggered, causing sickness. However, researchers caution that more work is needed to establish clear physiological pathways.
The impact of odours also depends on psychological factors. Pamela Dalton, a cognitive psychologist at Monell Chemical Senses Center, explains that 'the health impact is mediated through an individual dislike or fear of an odour.' Anxiety about a smell can amplify its effects, making some people more vulnerable to symptoms than others.
