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21 Cards in this Set

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