CONCLUSIONS

From our experiences over the years we can draw two important conclusions. First, the technical know-how and the actual control devices are now available for the control of almost any air pollution problem existing from stationary sources and soon will be available for the control of vehicular sources. Second, each community must determine for itself the degree of clean air it desires and the price that the community is willing to pay for that degree of clean air.

In Los Angeles, the price has been high because the control program was a pioneering effort. The price in other areas should be much lower because of that effort. Results, answers and techniques now are available that can be of benefit to other areas. Our experiences need not be repeated in every urbanized area facing an air pollution problem. The mistakes, as well as accomplishments, should prove valuable guidelines for other areas to follow. The price any community pays, therefore, for a comparable reduction in air pollution should be far less than it has been for Los Angeles.

PHOTOGRAPHIC CASE HISTORIES

OF

AIR POLLUTION CONTROLS

PIONEERED BY THE ENGINEERING DIVISION

OF THE

AIR POLLUTION CONTROL DISTRICT

OF

COUNTY OF LOS ANGELES

Figure 1. Baghouse for filtering out dust and fumes in the exit pases from a rotating sweat furnace. Belgian retort furnaces, and zinc melting reverberatory furnaces. Usable zinc oxide is collected in the bags.

Chlorine gas

Figure 2. Sea water scrubber serving a fish meal drier.
is injected into the combustion gases from the drier before they are
passed into the scrubber.

77-536 O -67 - 20

Figure 3. Activated carbon adsorbers used to collect hydrocarbon vapors from a degreasing process.