Air Pollution is a problem commonly occurring in the wake of large-scale industrialization. This problem is mostly seen in large cities where large or small scale industries are located and where vehicular traffic predominates.
Noise is increasingly becoming a major pollutant. This is the result of progress in technology. The aggressive noise of road and air transport, noise produced in the factories in congested business centers comes in this type of pollution.
Water is most abundant and important natural resource used by man. Water quality is the most important aspect in any industry. For example, in processed food industry, water is used for purposes like processing, washing, flushing and general usage, for boiler feed and cooling.
Microorganisms are omni present. They are both harmful and harmless in nature. Their load in air, water and foodstuffs reflects its quality. Waters of all kinds contain a variety of microorganisms derived from various sources like soil and vegetation.