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21 Cards in this Set
- Front
- Back
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Unwanted sound
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Noise
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The condition in which noise has characteristics and duration injurious to public health and welfare or unreasonable interferes with the comfortable enjoyment of life and property in such areas as are affected by the noise
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Noise pollution
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The total noise in a given situation or environment
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Ambient noise
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The weighted sound pressure level in dBA obtained by the use of an approved type sound-level meter
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Noise level
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The energy transferred per unit time (in seconds) through a unit area normal to the direction of propagation
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Intensity
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The sound level or sound pressure level as perceived by an observer
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Loudness (amplitude)
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A dimensionless unit to express physical intensity or sound pressure levels
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Decibel
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The number of times a complete cycle of pressure variation occurs in 1 second, both an elevation and a depression below atmospheric pressure
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Frequency
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The presence of solids, liquids, and gases in the outdoor air in amounts that are injurious or detrimental to humans, animals, plants, or property
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Air pollution
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Lower atmosphere
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Tropisphere
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Higher atmosphere
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Stratosphere
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A pollutant that is found in the atmosphere in the same form as it exists when emitted from the stack
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Primary pollutant
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A pollutant that is formed in the atmosphere as a result of reactions such as hydrolysis, oxidation, and photochemistry
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Secondary pollutant
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The physics, chemistry, and dynamics of the atmosphere, including many direct effects of the atmosphere on the earth’s surface, ocean, and life
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Meteorology
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The natural and man-made features of the earth’s surface
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Topography
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Graphic presentation of long-term wind data at a given location
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Wind rose
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Ability of the atmosphere to enhance vertical air motions
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Instability
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Ability of the atmosphere to suppress vertical air motions
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Stability
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A phenomenon that develops at night under conditions of relatively clear skies and very light winds
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Radiational inversion
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A phenomenon that develops in high-pressure systems (generally associated with fair weather) within a layer of air aloft when the air layer sinks to replace air that has spread out at the surface
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Subsidence inversion
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A phenomenon that develops when air masses of different temperature characteristics meet and interact so that warm air overruns cold air
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Frontal inversion
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