Enclosed Sezotoves hold out the possibility of greater efficiency, controllability and lower smoke emission than simple open fires.

Explosions ceased on 15 July, although smoke emissions were still observed as late as 23 August.

The stated purpose was to reduce the characteristic blue smoke emission for which the car was known.

This was not technically possible to achieve until the firebox arch came into use, but burning coke, with its low smoke emissions, was considered to meet the requirement.

That has reduced residents' complaints about visible smoke emissions from visiting ships.

They have given the cruise line operators until the end of 1992 to sharply reduce the smoke emissions.

A vast, smoke-blackened furnace; 100 people to do the work; massive investment - the company spent £2m last year on cleaning up smoke emissions.

Vehicles with diesel engines will be checked for smoke emission, using smoke meters.

Secondhand smoke is the combination of both sidestream and mainstream smoke emissions.

As well as having reduced smoke emissions, the new engine was much more powerful than the existing ones.