An instrument that measures the degree or intensity of haze in the atmosphere, used in meteorology and air quality monitoring.
Compound of 'haze' and Greek 'metron' (measure); a scientific instrument term from the 20th century as air pollution monitoring became important.
Hazemeters became crucial in the 1950s when cities like Los Angeles and London realized they had serious air quality problems—the instruments proved the smog wasn't just fog!
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