Ozone depletion is another result of pollution. Chemicals released by our activities affect the stratosphere , one of the atmospheric layers surrounding earth. The ozone layer in the stratosphere protects the earth from harmful ultraviolet radiation from the sun.
When people think about air pollution, they usually think about smog, acid rain, CFC's, and other forms of outdoor air pollution. But did you know that air pollution also can exist inside homes and other buildings? It can, and every year, the health of many people is affected by chemical substances present in the air within buildings.
The United States has a population of 296 million and 39 cities that have more than one million people.
India has 37 cities with a population of 1 million or more people, which is surprisingly low given its national population of over 1 billion.
China has 94 cities with more than a million people each, accounting for nearly a quarter of the global total 408 such cities. However only 15% of China’s total population of 1.4 billion lives in those cities
NTPC is a major power providing corporation in India. It has ISO certification for EMS (Environment Management System) 14001. The corporation has a pro-active approach for preserving the natural environment and resources like water, oil and gas and fuels in places where it is setting up power plants.
Noise pollution not only results in irritation and anger, it can also cause hearing impairment, increased heart rate and blood pressure among other physiological effects. Unwanted sound is an irritant and a source of stress. Industrial and construction activities, machinery, factory equipment, generators, saws and pneumatic and electric drills also make a lot of noise.
Noise pollution is gradually becoming a problem in cities as the population is growing and places are getting shorter. Even certain small scale companies or factories can be found in the city limits, for they were setup prior to urban development. Another major contributor to the noise is honking of sirens and horns by the vehicles which cause too much of mental disturbance.