Bristol's CAZ has reduced inner-zone NO₂ but outdoor PM2.5 still exceeds WHO guidelines. The city's Victorian and Edwardian stock — heavily retrofitted in the past decade — produces high condensation and mould risk in winter.
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Bristol's air-quality context
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Building-type risks
Retrofitted period homes. Insulation and glazing upgrades without parallel ventilation upgrades — damp, mould, CO₂ accumulation. Humidity & health →
Harbourside offices. Modern sealed buildings where AHU performance and filter spec are the binding constraint. Office air quality →
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What to do
Pair envelope tightening with mechanical ventilation, specify ePM1 50% (MERV 13) filtration, and run continuous PM2.5, CO₂ and humidity monitoring. IAQ monitoring →
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Services across Bristol & the South West
IAQ testing, VOC and mould investigation, ventilation assessment and monitoring across Bristol, Bath, Weston-super-Mare and the wider South West. Reports against WHO, BS EN 16798-1, WELL and BREEAM benchmarks.