The simplest definition of pollution is the introduction of new pollutants into the environment or the occurrence of new pollutants or the excess of the natural average annual level of these pollutants.
From an environmental point of view, pollution is not just the introduction of components that are alien to it, but bringing them into the ecosystem. Many of them are chemically active and are able to interact with molecules that make up the tissues of living organisms or actively oxidize in air. Such substances are poisons to all living things.
According to environmental factors, there are main 3 types of pollution which have become the prime reason for humans health change.
1. Air pollution ,
2. water pollution ,
3. soil pollution
Land pollution: The cleanup of garbage has become an important issue in major cities. Many of the 10 million tons of garbage per day cannot be incinerated or corrupted, such as the first enemy of humans such as plastics, rubber and glass.
Marine pollution: mainly crude oil leaking from oil tankers and oil wells , pesticides and fertilizers used in farmland, sewage discharged from factories, and acidic solutions from mines; they cause most of the marine lakes to be polluted, resulting in not only marine life. Victims are that birds and humans may also be poisoned by eating these creatures.
Air pollution: refers to the concentration of pollutants in the air
Degrees reach or exceed the degree of harmfulness, leading to the destruction of the normal survival and development of ecosystems and humans, causing harm to people and organisms. This is the most direct and serious, mainly from carbon monoxide and hydrogen sulfide released from factories, automobiles, power plants , etc. Every day, people are exposed to these dirty air and get infected with respiratory organs or visual organs.
Water pollution: refers to the change of characteristics of chemical, physical, biological or radioactive pollution caused by the intervention of a certain substance, which affects the effective use of water, endangers human health or damages the ecological environment, and causes deterioration of water quality. .
The concentration and toxicity of pollutants will naturally decrease. This phenomenon is called environmental self-purification . If discharged
The quality exceeds the self-purification ability of the environment and Change in pollution has reduced biological production and increase environmental damage .
Source of pollution
Environmental pollution sources are mainly
The following aspects:
(1) Waste smoke, waste gas, waste water, waste residue and noise discharged from the factory ;
(2) Waste smoke, exhaust gas, noise, dirty water, garbage discharged from people’s lives;
(3) Exhaust gases and noise emitted by vehicles (all fuel vehicles, ships, aircraft, etc.);
(4) Water that is used after irrigation of farmland using chemical substances such as chemical fertilizers, insecticides, and herbicides ;
(5) Mine wastewater and waste residue;
(6) Machine noise, electromagnetic radiation, carbon dioxide pollution;
The main pollutants in the air are sulfur dioxide, nitrogen oxides , particulate pollutants, and acid rain.