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some cases, approval was granted in all but two instances.
Circular 52/67 was issued jointly by the Ministry of Housing and Local
Government and the Welsh Office on the reduction of air pollution by grit and
dust discharged from boiler and furnace chimneys.
The circular "Grit and Dust" supplements the Explanatory Memorandum on
the industrial provisions of the Clean Air Act, 1956, and is based on the report
of a working party which the Clean Air Council agreed should be set up to consider
ways and means of measuring grit and dust emissions and to advise on appropriate
levels of emission.
Measurement of Atmospheric Pollution
The London Borough of Enfield is one of the participating authorities in the
National Survey of Air Pollution. Four smoke filter and sulphur dioxide volumetric
measuring instruments are sited in selected areas of the borough and the measurements
taken daily. The results are forwarded to the Fuel Research Station of the
Ministry of Technology.
Station 1 is sited at Honilands School, Bullsmoor Estate, Enfield.
Station 2 is sited at the Brimsdown Pumping Station, Stockingwater Lane,
Enfield.
Station 3 is sited at Merryhills School, Worlds End Lane, Enfield.
Station 4 is sited at Bush Hill Park Library, Fourth Avenue, Bush Hill Park.
Station 1 is in a smoke control area; station 2 is in an industrial area; station
3 is in a residential area with a low population density; station 4 is in a residential
area with a high population density.
Separate from the National Survey are three other instrument stations which
are sited as follows :
(a) Latymer Grammar School, Hazelbury Road, N.9.
(b) Huxley Secondary Modern School, Silver Street, N.18.
(c) Mandeville Secondary Modern School, Cuckoo Hall Lane, N.9.
The measurements from these instruments are also forwarded to the Fuel
Research Station.
Reference to the Graph Representation of Air Pollution substantiates the
gradual improvement in the situation over recent years brought about by the establishment
of Smoke Control Areas.
During 1967 an infra-red gas analyser was sited in Enfield Town to check
automatically and continually the level of carbon monoxide in the atmosphere. The
survey is being carried out for the Ministry of Technology to indicate the
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