1. Chemical pollution

Chemical pollution mainly refers to the pollution of agricultural chemicals, food additives, food packaging containers and industrial wastes, and the pollution caused by mercury, cadmium, lead, arsenic, cyanide, organophosphorus, organochlorine, nitrite, nitrosamine and other organic or inorganic compounds.

2. radioactive pollution

radioactive pollution: radioactive substances in food are radioactive substances from the earth's crust, which is called natural background; There are also radioactive substances produced by nuclear weapons testing or peaceful use of radioactive energy, that is, man-made radioactive pollution (see the impact of radioactive pollution on health).

3. Biological pollution

Biological pollution is mainly caused by harmful microorganisms and their toxins, parasites, their eggs and insects. Animal foods such as meat, fish, eggs and milk are easily contaminated by pathogenic bacteria and their toxins, leading to bacterial food poisoning and infectious diseases of people and livestock.

4. Pollution during production, storage, transportation and marketing

Food is easily contaminated by bacteria during production and marketing. Poor hygienic operation and management can easily contaminate food with some bacteria in the environment, equipment and utensils.

5. Pollution in the cooking process

In the food processing process, the hygiene requirements such as cooking thoroughly, separating raw from cooked, mechanical washing, etc. were not strictly implemented, and unscientific management methods led to the proliferation and growth of existing or contaminated bacteria in food, which led to the decline of food quality.

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