What is the pollution in the classroom? What are the main air pollutants in classrooms?

Campus environmental pollution.

There are mainly water pollution, air pollution, solid waste pollution and noise pollution. The main source of campus water pollution is domestic sewage, including toilet flushing water from canteens, dormitories and teaching buildings, and since most of it enters the sewage pipe network, the environmental impact is generally not significant. However, if the drainage channels in the campus are partially leaking due to disrepair, or even some of the pipes are incomplete, it is easy to emit odors and seriously affect the air quality of the campus.

Domestic sewage that does not enter the sewage pipeline will not only cause air pollution, but also enter the ground through infiltration, pollute the underground water source, and affect the quality and safety of drinking water. In addition, the new factories around the school building and the industrial and domestic emissions around the new school building will also bring uncertain pollution. The main sources of air pollution on campus come from the emission sources of stoves and heating equipment in canteens and restaurants.

Especially in the heating season in the north in winter, if the amount of coal burned is large, the coal quality is poor, the combustion is incomplete, and the chimney is low, the soot and carbon monoxide will be produced.

The amount of harmful gases such as sulfur dioxide will be relatively large. Secondly, if the experimental equipment is not perfect, it will also cause some experiments to produce toxic and harmful and volatile gases into the atmosphere and bring air pollution. The problem of indoor environmental chemical pollution in new facilities, renovated classrooms and school buildings is mainly formaldehyde pollution caused by paints and coatings and wood-based panels.

Benzene contamination and volatile organic compound contamination. Campus solid waste.

Pollution can be divided into two categories, one is domestic waste.

It mainly includes leftover rice, vegetable residues, fruit peels, waste paper, packaging bags, disposable tableware and other domestic wastes and branches and leaves. Another type of solid waste is construction waste, mainly waste soil masonry discharged from construction sites, which occupies limited campus space, but affects the beautification of the campus and causes environmental pollution. Solid waste pollution is the most important pollution on campus, which is not only toxic in itself, but also causes pollution of air, water, soil and other media.

Noise, dust, air pollution.

For example, classmates eat spicy strips, and the dust from the window, in addition, the ash of chalk is also poisonous.

Dust, odor, noise, lack of oxygen.

In recent years, the phenomenon of excessive air pollutants in classrooms is not uncommon, and there is a trend of gradual intensification, and the pollutants that cause the decline of classroom air quality mainly include:Inhalable particulate matter(PM10, PM2S), CO2, total volatile organic compounds (TVOC), microorganisms, etc.

(1) Inhalable particulate matter exceeds the standard. Inhalable particulate matter in the classroom** is not easy to settle due to the use of indoor chalk, cleaning and outdoor dusty gases, and PM2 particles can directly enter the human alveoli through the respiratory tract.

Predispose to asthma.

and other respiratory diseases, and the harmful substances attached to its surface will then enter the bloodstream, causing blood vessel lesions.

(2) CO pollutionCO concentration is a sensitive indicator of indoor air quality, although CO is not a toxic pollutant, but when the fresh air is insufficient, the breathing of personnel will cause the accumulation of indoor CO, and too high CO will cause acidosis.

and hypoxemia.

It has been found that the CO concentration of 60 minutes of classroom time in primary and secondary schools can exceed the standard by 1 time, which directly affects the comfort and learning efficiency of indoor personnel.

(3) Benzene series exceeds the standard. Benzene is mainly used in decoration materials, which is easy to accumulate in new and renovated classrooms, but with the growth of decoration time and the increase of ventilation, the content of benzene will be reduced, and the accumulation of benzene series is easy to cause allergic damp rash and aplastic anemia.

and many other diseases.

(4) TVOC exceeded. Building materials, interior decoration materials, living and office supplies are the main sources of VOCs in the classroom, and long-term exposure to VOCs exceeds the standard may cause immune disorders in the body and affect the central nervous system.

and the digestive system to cause serious damage.

(5) Microorganisms exceed the standard. Most of the microorganisms in the classroom come from the outdoors and are carried by the human body into the room, which is easy to form cross-infection in confined spaces, which can easily cause asthma and dry cough.

Upper respiratory tract diseases such as pneumonia. Studies have shown that fungi are easy to attach to the surface of particles with small particle size, and particulate matter provides the carbon, iron, nitrogen and other elements needed for the growth of fungi for the reproduction, so the fungal concentration is directly related to the mass concentration of particulate matter.

1. Polluted air: Garbage is a mixture of complex compositions. In the process of transportation and open stacking, the decomposition of organic matter produces a foul odor, and releases a large number of pollutants such as ammonia and sulfide into the atmosphere, which contains more than 100 kinds of organic volatile gases, and these releases contain many carcinogenic and teratogenic substances.

Plastic film, paper scraps and dust are blown by the wind to form "white pollution";

2. Infectious diseases: garbage not only contains pathogenic microorganisms, but also provides food, habitat and breeding places for old locust rats, birds, mosquitoes and flies, and is also the root cause of infectious diseases.