Ventilation: Approved Document F, Volume 1 — Dwellings

O N L I N E V E R S I O N F1(1) Section 2: Minimising the ingress of external pollutants 2.1 Ventilation systems should be designed to minimise the intake of external air pollutants following paragraphs 2.2 to 2.9 if either of the following applies. a. The pollutant values in the location of the dwelling exceed any of the limits in Table 2.1. This may have been determined through an air quality assessment. Where modelling or monitoring data is required, expert advice should be sought. b. The dwelling is located near to any of the following sources of significant local pollution. i. Road traffic, including traffic junctions and underground car parks. ii. Combustion plant (such as heating appliances) running on conventional fuels, most commonly natural gas. iii. Other combustion processes (for example, waste incineration, thermal oxidation abatement systems). iv. Discharges from industrial processes. v. Fugitive (i.e. not effectively controlled) discharges from industrial processes and other sources. vi. Exhaust discharges from building ventilation systems. vii. Construction and demolition sites, which are a source of particles and vaporous discharges. viii. Other significant sources of local air pollution which may be detrimental to health. Table 2.1 Limit values from Schedule 2 to the Air Quality Standards Regulations 2010 Pollutant Exposure limit Exposure time Carbon monoxide 10mg/m3 8-hour average Sulphur dioxide 350μg/m3 1-hour average 125μg/m3 1-day average Nitrogen dioxide 200μg/m3 1-hour average 40μg/m3 1-year average Benzene 5μg/m3 1-year average Lead 0.5μg/m3 1-year average PM 25μg/m3 1-year average 2.5 PM 50μg/m3 1-day average 10 40μg/m3 1-year average NOTE: This section only gives guidance for typical situations. Expert advice may also be able to provide additional guidance on the suitability of other technologies to minimise the intake of external air pollutants, including filtration. 19 Building Regulations 2010 Approved Document F Volume 1, 2021 edition O N L I N E V E R S I O N