1. In low pressure systems air flows (a) downward and outward (b) downward and i
ID: 158893 • Letter: 1
Question
1. In low pressure systems air flows (a) downward and outward (b) downward and inward (c) upward and outward (d) inward and upward
2. Nature produces significant quantities of a variety of pollutants. Despite this, in most cases natural air pollution poses little risk to humans. This is due to the fact that (a) atmospheric levels are often quite low (b) large distances often separate sources and large human populations (c) some natural pollutants are produced episodically and therefore are transient (d) all of the above
3. An increase in tropospheric carbon monoxide levels will (a) decrease tropospheric ozone (b) increase tropospheric ozone (c) decrease tropospheric methane (d) increase tropospheric sulfur oxides
4. National emission estimates for ozone are not made by USEPA because (a) sources are small and widely scattered (b) ozone is not an important air pollutant (c) ozone is, for the most part, not emitted to the atmosphere (d) all of the above
5. The effect of wind direction on a plume is to (a) increase ground level concentrations when wind direction has limited variability (b) decrease ground level concentrations when wind direction is highly variable (c) decrease effective stack height (d) all of the above (e) a & b
6. The major direct cause of haze over the eastern half of the United States is (a) plume blight (c) nitrate aerosol (d) automobile emissions
7.Bromine is more effective in destroying stratospheric ozone because it ( (b) is less efficiently removed by sink mechanisms (c) serves to form ice crystals (d) all of the above
8.Key factor(-s) causing the Antarctic ozone hole is/are (a) warm atmospheric temperatures (c) nitrous oxide (d) all of the above
9.It is difficult to establish a cause-effect relationship between ambient pollutants and health effects because (a) it is difficult to assess actual exposures (b) individuals are exposed to a variety of pollutants at the same time (c) a variety of factors tend to confound such relationships
10.The pollutant associated with increased mortality in contemporary air pollution episodes is (a) lead (b) sulfur dioxide (d) carbon monoxide
11.Regulatory or non-regulatory actions taken to reduce diseases risk associated with pollutant exposures is (a) hazard identification (b) exposure assessment (d) risk assessment
12.Risk assessments are conducted for pollutants regulated (a) under air quality standards (b) under hazardous air pollutant/air toxic provisions of clean air legislation (c) by the Centers for Disease Control (CDC)
13.Using comparative risk assessment as a tool for regulatory actions, which of the following statements would be true? (a) most toxic pollutants are not harmful (c) many more pollutants would be regulated if such an assessment were made (d) none of the above
14.A biologically-active form of mercury is (a) ionic mercury (b) elemental mercury (d) none of the above
Explanation / Answer
1.(d) inward and upward
When low pressure is there air moves up.
2.d
3.b
NOx, CO, and VOCs are called ozone precursors
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