Paragraph 5 Position of monitoring equipment
Equipment for measuring PM2.5 levels at monitoring stations must be positioned in accordance with the following criteria—
(a)
the flow of air around the sampling inlet must be unrestricted (free in an arc of at least 180° if the equipment is affixed or adjacent to a building or 270° otherwise);
(b)
the sampling inlet must—
(i)
be not less than 0.5 metres from the nearest building, tree or other obstacle; and
(ii)
not be positioned in the immediate vicinity of a source of PM2.5 emissions;
(c)
the height of the inlet sampling probe must be not less than 1.5 metres and not more than 8 metres above the ground;
(d)
the sampler’s exhaust outlet must be positioned so that recirculation of exhaust air to the sampler inlet is avoided.