|
Occupational exposure limits are the maximum allowable concentrations of hazardous elements in the air. They are defined by scientific laboratories in order to control the level of pollution in different areas. Among the main atmosphere pollutants are large-scale industry, domestic boilers and transport. The portion of each of these pollutants is different from place to place, but industrial companies are considered to be the worst pollutants. The major sources of artificial aerosol pollution of the atmosphere are thermal power plants that burn a large amount of coal with high ash content, concentrating mills, metallurgical, cement, magnesite and soot plants. |
Environmental problems
It's probably hard to find a person who doesn't know anything about the environmental problems facing the humanity today. Literally every boy and girl are taught at school about how bad the situation is and how evil the whole mankind is to make this happen. Then we grow up and see the same thing on TV, news reporters telling us about new ecological catastrophes, frightening figures and awful proofs. And I assume that most of us are against this development of affairs. So here we've got the question: why nothing is changing? Or if it's changing why we don't see anything? Will we ever see any change at all? Is it possible to cure the planet from the disastrous influence of the human activity? Well, these are the questions that bother many people today.
There are lots of types of environmental pollution. Everything around us is being polluted: water, air, ground and even the outer space. There are so many types of human activities affecting the ecological situation that it's even hard to define which of them are most harmful for the earth and, as a result, for every single living creature on it. The ecologists all over the world are warning the society and especially politicians about the need of urgent measures to be taken in order to at least hold up the process of slow killing of nature.
The man began polluting the planet at such a fast pace with the advent of industrialization. Today we need more and more resources and we'll never get satisfied with what we have. We need more power, we need more products, we need more comfort. That's why we're burning more and more natural resources, making more and more chemical substances that are detrimental both for us and for the biosphere, making more and more waste and have nowhere to put it, killing more and more of virgin nature. Instead, we build more plants, buy more cars and throw away more waste.
The most dangerous is the pollution of the environment with chemical substances that never existed in natural conditions before. Among them are aerosols, fertilizers, oil, industrial waste and others. All they influence greatly the processes going on in the biosphere. That's why people should unite as soon as possible in order to take urgent measures. There is a positive tendency today of global awareness about the problem, and some attempts to change the situation have already been made. But a lot is still to be done.
