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NI-wide·Technical Booklet K Ventilation

The Air Quality Standards Regulations (Northern Ireland) 2010 transpose EU Directive 2008/50/EC on ambient air quality and cleaner air for Europe and include certain provisions of Directive 2004/107/E

NI-wide·Technical Booklet K Ventilation

exposure to the following levels of nitrogen dioxide (NO2) should not be exceeded – (i) 288 μg/m3 (150 ppb) – 1 hour average (Department of the Environment, 1996); or (ii) 40 μg/m3 (21 ppb) – long-ter

NI-wide·Technical Booklet K Ventilation

exposure to the following levels of carbon monoxide should not be exceeded – (i) 100 mg/m3 (90 ppm) – 15 minute averaging time (WHO, 2000); (ii) 60 mg/m3 (50 ppm) – 30 minute averaging time (WHO, 2000

NI-wide·Technical Booklet K Ventilation

exposure to the following levels of carbon monoxide for occupational exposure should not be exceeded – 35 mg/m3 (30 ppm) – 8 hours averaging time (HSE, 2003).

NI-wide·Technical Booklet K Ventilation

exposure to Total Volatile Organic Compound (TVOC) levels should not exceed 300 μg/m3 averaged over 8 hours (ECA, 1992);

NI-wide·Technical Booklet K Ventilation

ozone levels should not exceed 100 μg/m3 (Department of the Environment, 1994b).

NI-wide·Technical Booklet K Ventilation

The guidance within this Technical Booklet may not be adequate to address pollutants from occasional, occupant-controlled activities such as painting, smoking, cleaning or other highly-polluting activ

NI-wide·Technical Booklet K Ventilation

For pollutant sources such as urban road traffic, whose concentration fluctuates with the time of day, reducing the flow of external air or closing ventilation intakes during peak periods of high exte

NI-wide·Technical Booklet K Ventilation

However, care must be taken since, e.g. reducing the inflow of external air will also reduce the outflow of internal air, resulting in a build-up of internally generated pollutants that need to be rem

NI-wide·Technical Booklet K Ventilation

The location of exhausts is as important as the location of air intakes. These should be located such that re-entry to a building, or ingestion into other nearby buildings, is minimised (for both natu