dthe
of Dust
Dust emissions from demolition sites can (and often will) give rise to local annoyance by causing soiling of surfaces, and may cause exceedences of air quality standards for fine airborne particulate matter (the so-called PM10 fraction – fine dusts that are less than one-hundredth of a millimetre in diameter).
In December 2011, the Institute of Air Quality Management (IAQM) published guidance to assist developers and local planning authorities to assess the impacts of demolition and construction activities, and how to determine their significance.
The guidance takes a risk-based approach, taking account of the nature of the activities, their scale and duration, and the proximity of nearby, sensitive receptors. Importantly, the guidance recognises that different phases of the activities can have very different impacts, and so applies the risk assessment separately to demolition, earthworks, construction and
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Demolition activities may be categorised as “negligible”, “low”, “medium” or “high” risk, using professional judgment and taking into account the size of the building being demolished, the types of building materials present (e.g. “dusty” materials such as concrete, or “non-dusty” materials such as cladding or timber), and the types of activities that will be used (e.g. whether on-site crushing and screening is to be used).
On smaller sites, it may also be appropriate to take account of the season; for example, if the demolition works are expected to be completed during the wetter, winter months. The risk category assigned to the demolition
activities is then used to determine the level of mitigation that should be applied to reduce dust emissions and minimise impacts.
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