Q7. Which legislation is framed at preventing the emission of black smoke, sets the limits on the length of time of such emission?
A. Discuss the reasons for setting time limits rather than imposing a complete ban on emission
B. State why different times are quoted, giving examples.
C. State the likely constituents of black smoke from the combustion of residual fuel in a boiler.
D. List the contaminants likely to be found in the clear exhaust from a diesel driven alternate burning gas.