Atmospheric Pollution by J.C. Jones

By J.C. Jones

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Domestic wood stoves Use of such stoves prevalent in rural areas. 35 million. This is attributed to the use of wood as a domestic fuel in the country areas. Car tyres Comparable to the PM10 release from the engine, but not controllable by a catalyst as the ‘combustion PM10’ is. 5 Measurement of PM10 PM10 can of course be measured by manual weighing of filters in which it has deposited. The technique is known as ‘filter gravimetry’. Other methods are used including the ‘oscillating microbalance’, in which PM10, separated from larger particles by filtration, impinges upon a vibrating surface.

A reader will appreciate that each of these figures has a large plus-or-minus on it. The figures are examined and processed in the semi-quantitative calculations in the shaded area below. Averaged emission = 32 u 106 kg u 106 mg kg-1/[250 u 109 mile u (8/5) km mile-1] = 80 mg per km and order of magnitude agreement is clear. Emission per vehicle per year = 32 u 106 kg/(27 u 106) vehicles | 1 kg per vehicle per year which is a helpful figure for semi-quantitative work. Note that for a rough calculation like this one there is nothing to be gained from distinguishing dieselpowered vehicles from gasoline-powered ones.

M. would be a typical level of carbon monoxide, and a suggestion that cars have contributed 30% of this is intuitively sensible11. The figure would of course rise if buses and trucks were factored in. 3 Miscellaneous sources of carbon monoxide [1] Mobile sources other than road vehicles, including bulldozers, mobile excavators, farm machinery and domestic lawnmowers, contribute significantly to carbon monoxide build-up, two thirds to a half the contribution from road vehicles. That from aircraft is small and that from ships and railways is even smaller.

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