(1) Harmful factors produced in the production process 1. Toxic substances caused by chemical factors (1), such as lead, mercury, benzene, toluene, ethylbenzene and styrene in ethylene production; There are dozens of butadiene, styrene, high aromatic oil, sodium nitrite and dicumyl peroxide in the production of styrene-butadiene rubber. (2) Productive dust, such as petroleum coke dust in the process of petroleum refining, uses aluminum silicate powder as catalyst (dust), etc. In the process of catalyst production, there are metal dust, cement dust and so on. In addition, there are asbestos dust and coal dust. 2. Physical factors (1) Abnormal meteorological conditions such as high temperature, high humidity and low temperature. (2) Abnormal air pressure, such as high air pressure and low air pressure. (3) Noise and vibration. (4) Non-ionizing radiation, such as visible light, ultraviolet light, infrared light, radio frequency, microwave and laser. (5) Ionizing radiation such as X-rays and γ-rays produced by radioisotope instruments. 3. Biological factors, such as Bacillus anthracis attached to fur and mold on bagasse. The petrochemical industry is rare. (II) Harmful factors in the labor process Labor process refers to the labor organization, operation posture and mode in the production process, and the ratio of manual labor to mental labor. The harmful factors in this process are: ① unreasonable labor organization and system, unreasonable work and rest system, etc. ② Mental stress; The degree of automation is high, and instruments replace heavy manual labor and manual operation, which also brings mental stress problems. (3) The labor intensity is too high or the production quotas is improper, such as the arranged homework is not suitable for the physiological conditions of employees. 4 individual systems or organs are too nervous, such as poor eyesight.