TABLE OF CONTENTS See odour control , odour threshold.
Smoky fog. See London smog , photochemical smog.
Flue gas after it has left the chimney that includes suspended dust, grit, fly ash, tar, vapour, soot, carbon dioxide, sulphur dioxide, oxygen, nitrogen, etc., and rarely a coloured gas such as nitrogen dioxide. See gas cleaning plant , tobacco smoke.
An instrument that can be installed at a flue to record the darkness of the smoke that passes through it. A light ray passes through the smoke on to a photoelectric cell.
A method for testing of drainage installations. It involves injecting smoke into the stack and looking for leaks of smoke.
In rivers, large debris such as logs and branches that fall into rivers and become stuck. The removal of snags is known as de-snagging.
The concentration or dose of a toxic chemical that is expected not to cause an adverse health effect.
In an electrostatic precipitator, the wires and plates cannot reach completely to the top, bottom and sides of its container because of the high charge on the wires. Some of the gas inevitably passes through a region of poor collection. This is known as sneakage.
A light fence of vertical pales nailed to alternate sides of the fence, thus leaving gaps for wind to pass through but holding...
