occurring temperature inversion occurs over Antarctica.
Figure 9.5 Temperature inversionNOISE POLLUTION
Noise pollution is unwanted human-created (anthropogenic) sound that disrupts
the environment. The dominant form of noise pollution is from transportation
sources (e.g., motor vehicles, aircraft noise, and rail transport noise). Noise
regulation by governmental agencies effectively began in the United States with
the 1972 Federal Noise Control Act.
Effects of Noise Pollution
Normal hearing depends on the health of the inner, middle, and outer ear.
Sensory hearing loss is caused by damage to the inner ear and is the most
common form associated with noise.
In addition to contributing to hearing loss, excessive noise can cause
cardiovascular problems, which manifest as an accelerated heartbeat and high
blood pressure, gastrointestinal problems, a decrease in alertness and the ability
to memorize, nervousness, and anxiety.
Noise Control Measures
Below are some mitigation techniques to reduce noise: