tailieunhanh - PREVENTION AND CONTROL OF AIR POLLUTION BY PROCESS CHANGES OR EQUIPMENT

Note that, although this diagram provides a collapsed view of a complex process that comprises many different players and steps, it accurately reflects how policy on air pollution is set, who the different players are in that process, and how the information they need flows through the decision-making chain. We have used this model to develop the Apheis communications strategy and to determine specifically with which audiences we need to communicate, what information each audience needs, and in what form they need it. Figure 2 below adds a new and important layer of information to Figure 1, and shows that information is processed at virtually every step. | Andrew H. rose JR . David G. STEPHAN . . . Robert L. STENBURG . . PREVENTION AND CONTROL OF AIR POLLUTION BY PROCESS CHANGES OR EQUIPMENT Introduction Atmospheric waste products may be classified in two broad categories aerosols and gases. Aerosols are liquid or solid particulates in suspension in a gaseous medium usually air. In the field of air pollution these particulates are more specifically classified in terms of their method of generation each class being further characterized by a particle-size range. Dusts are solid particles formed by some disintegration process such as crushing grinding or demolition. Normally dust particles range above 2 ÌX in diameter but have been found to be as small as JX. Fumes are solids generated by the condensation of vapours and may result from sublimation distillation or foundry processes or from chemical reactions. The normal particle size of a fume is less than 1 X. Fumes are often metals or metal oxides and their composition may differ materially from the substance from which they originated. Mists are liquid droplets smaller than 10 X in diameter and are generated by condensation. Sprays are larger liquid droplets which are created by some mechanical disintegration process. In the collection of liquid or solid aerosols chemical identity is not normally a factor in the choice of a control technique however in the control of gaseous emissions chemical properties are often paramount in developing the technique employed. The degree of source control necessary to overcome a specific area s air pollution problem is a function of the mass rate of emission of contaminants to the atmosphere within that area the particular source concentrations present the meteorological characteristics of the area and the area s air pollution susceptibility. Department of Health Education and Wetfare Public Health Service Air Pollution Engineering Research Cincinnati Ohio USA. 307 308 A. H. ROSE D. G. STEPHAN R. L. .

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• infectious disease
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• disease burden
• highest prevalence
• atypical symptoms
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• Infectious bursal disease in chickens
• Immunological efficacy than LIBDV
• Infectious bursal disease
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• Decrease response to vaccination
• Synthetic peptide
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