The change most visitors probably didn't notice
On a busy market morning in Grantham's Market Place, the soundtrack used to arrive before the stalls did. Diesel generators — squat, humming units parked close to where traders set up — produced a low, mechanical drone that sat underneath every conversation, every transaction, every passing pushchair. The smell came with it: a faint, acrid drift of exhaust that varied with the load the engine was carrying. Most shoppers probably filtered it out within minutes. Some couldn't.
In February 2026, South Kesteven District Council began works to remove the need for those generators entirely. An £880,000 package — drawn from underspend within the Government's Future High Streets Fund — funded the installation of permanent mains electricity supply points across the Market Place and Westgate, along with the groundworks and connection infrastructure to support them. It followed an earlier phase of street-level improvements delivered by Lincolnshire County Council between May and September 2024, which raised road surfaces and connected the pedestrian areas. The power upgrade was the next, less visible layer.
The council's stated purpose was practical and trader-facing: 'a more welcoming and flexible space for community events', with market traders now able to plug directly into the grid. Nothing in the official framing mentioned disability, sensory access, or the specific populations for whom diesel noise and exhaust are not merely an inconvenience but a reason not to come at all.
That gap between the stated aim and the actual effect is the more interesting question. Who benefits most when a market town removes its generators — and did SKDC know, when it made an infrastructure decision, that it was also making an access decision?
What a diesel generator does at close range
Stand a market stall's width from a running diesel generator — roughly seven metres — and you are absorbing around 80 to 85 decibels of continuous mechanical noise. The National Institute on Deafness and Other Communication Disorders sets 70 dBA as the upper limit for long-term exposure that is unlikely to cause hearing damage. A running generator exceeds that by ten to fifteen decibels, which on a logarithmic scale represents a substantially larger real-world increase in acoustic energy than the numbers alone suggest.
The headline decibel figure, however, only captures part of the problem. Diesel generators produce significant low-frequency noise — the felt thrum that travels through the chest and presses against the ear canal as much as it enters through it. Low-frequency noise is harder to screen out than higher-pitched sound: it persists through physical barriers, does not diminish reliably with distance in the same way as higher frequencies, and creates a sense of physical presence even when the perceived loudness appears moderate. It is the reason a generator feels oppressive rather than merely loud.
The exhaust adds a separate layer. Diesel exhaust from a stationary engine contains particulate matter and noxious gases whose composition shifts with engine load and speed, meaning the chemical environment around an idling generator is neither fixed nor predictable. For someone with asthma or a chronic respiratory condition, proximity is not uncomfortable — it may be genuinely unsafe.
Taken together, the noise and the exhaust created a localised micro-environment in Grantham's Market Place that differed substantially from the surrounding street, even on an otherwise pleasant market morning.
The people generator noise is hardest on
For most visitors, a diesel generator's drone fades into background within a few minutes — something the brain learns to discount. For a proportion of the population, that discounting process does not work in the same way, or does not work at all.
Auditory hypersensitivity — clinically recognised and distinct from simply finding noise unpleasant — involves unusually negative reactions to sounds that others consider ordinary or tolerable. It restricts people's ability to participate in everyday activities and correlates with poorer mental health outcomes. It is not a preference; it is a physiological difference in how the nervous system responds to certain acoustic inputs.
Sensory processing disorder (SPD) describes a broader pattern in which the brain inadequately filters or integrates incoming sensory information across auditory, olfactory, and other channels. SPD co-occurs heavily with autism spectrum disorder, ADHD, and dyspraxia. A generator's specific characteristics — sustained, mechanical, low-pitched, unpredictable in its fluctuations — make it a particularly difficult input for someone with SPD: exactly the qualities least likely to habituate and most likely to push a sensitive nervous system into overload, the state at which accumulated sensory input exceeds what a person can process and still function.
The cognitive research extends the point beyond diagnosed conditions. Noise measurably increases arousal and narrows attentional bandwidth in people with no sensory processing differences at all. Browsing a market requires relaxed, diffuse attention — the kind that a sustained mechanical drone actively suppresses. The generator was not a problem only for a minority; it was a usability problem for a wide population, with the effects concentrated most sharply in those whose nervous systems process sensory load differently.
Behavioural exclusion rarely announces itself. People with sensory sensitivities do not leave a space and explain why; they simply decide, for reasons that may feel vague even to themselves, that the market is not somewhere they go.
The respiratory barrier generators created
Exhaust from a diesel generator running at variable load — its output shifting as it powers refrigeration for one stall and card readers for another — does not disperse evenly. The particulate matter and gases it releases vary with the engine's speed and demand cycle, making the chemical environment immediately downwind neither fixed nor predictable (no local air-quality measurements exist for Grantham's Market Place, but the general evidence on stationary diesel exhaust is well established). Market stall placement and event layout have not traditionally accounted for those dispersal patterns; exhaust drift has simply not been part of the design conversation.
For people with asthma, COPD, or other respiratory conditions, the implications are practical and immediate. Extended time near an idling generator unit can be medically inadvisable regardless of how brief the exposure feels. Unlike noise, which announces itself and is consciously processed, exhaust is invisible: it drives people away without leaving any signal that design or policy can easily register or measure.
The overlap with the sensory barriers described in the previous section is real, though the mechanism is entirely distinct — one is neurological, the other physiological. Removing the generators in February 2026 eliminated both forms of exclusion in a single infrastructure decision, neither of which was named in the brief.
Why the compounding effect matters more than any single change
The 2024 streetscape phase — delivered by Lincolnshire County Council between May and September of that year — already softened some of the harder edges of the Market Place before the power works began. Planters and raised pedestrian areas introduce visual texture and spatial definition; benches offer rest points that reduce the physical cost of lingering. These are not noise or air-quality interventions, but they lower a different set of thresholds: sensory, spatial, and physical.
What happens when all three layers shift together — the noise, the exhaust, the unrelieved hard surface — is not simply additive. A sensory-processing-sensitive person who can tolerate a market's visual complexity but not its acoustic load was previously excluded by one dominant barrier. Remove that barrier alongside two others, and the cumulative change in baseline conditions is greater than any single improvement would deliver on its own. Each element addressed a different channel of overload; reducing all three compounds the benefit in a way that no individual upgrade could replicate.
The ripple extends beyond the individual. When a child or adult with sensory sensitivities needs to leave early, everyone accompanying them leaves too. Carers, parents, and companions absorb the exclusion as a practical constraint on how long any of them can stay. Lowering the threshold of participation for one person in a group changes the visit for all of them.
None of this makes Grantham's Market Place fully sensory-friendly — no infrastructure project achieves that on its own. The claim is narrower, and more defensible: the combined changes meaningfully expand who can stay, and for how long.
Infrastructure decisions as accidental inclusion design
South Kesteven District Council's stated rationale for the generator-to-mains upgrade was trader experience and event flexibility — a more welcoming and flexible space, in the council's own words. No equalities impact assessment appears to have named sensory or respiratory disability as a driver of the decision. The inclusion benefit documented across the preceding sections was, in all likelihood, unstated and possibly unintended.
That observation carries no implied criticism. Public bodies make infrastructure decisions under cost and programme pressures that rarely leave room for detailed sensory-impact analysis. Nor is it straightforwardly a cause for praise: crediting SKDC with an accessibility win it did not frame as one misrepresents how the choice was made and what learning it generates.
What it is, more usefully, is a pattern worth naming. Infrastructure decisions routinely carry accessibility consequences — for who can enter a space, stay in it, and return to it — whether or not those consequences appear in the brief. The practical implication is that future projects in Grantham or elsewhere in South Kesteven could actively screen for sensory and respiratory load alongside the physical-access criteria that equalities assessments more reliably capture. That screening does not require new funding; it requires a different set of questions at the design stage.
When a public space decision is framed purely as a logistics or cost question, the sensory and respiratory consequences are already present in that choice. They simply go unnamed — and what goes unnamed in a brief tends to go unlearned for the next one.
- [1] Grantham. https://en.wikipedia.org/?curid=152678 https://en.wikipedia.org/?curid=152678
- [2] Sensory processing disorder. https://en.wikipedia.org/?curid=53638298 https://en.wikipedia.org/?curid=53638298
- [3] Diesel exhaust. https://en.wikipedia.org/?curid=1202358 https://en.wikipedia.org/?curid=1202358
- [4] Auditory hypersensitivity. https://en.wikipedia.org/?curid=81382826 https://en.wikipedia.org/?curid=81382826
- [5] Sensory overload. https://en.wikipedia.org/?curid=2308124 https://en.wikipedia.org/?curid=2308124