Dust is considered an environmental contaminant. Dust particles range in size from 1 µm up to about 500 µm. Approximately 60% of dust particles come from the outside homes through vents, windows, doors and contaminated clothing and other items brought home. ...  read more

Acoustic Noise is a type of sound that under specific circumstances is classified as an unwanted sound (or noise pollution). The same sound produced under different circumstances, may become a desired type of sound and will no longer be classified as noise pollution. ...  read more