Key Points

Environmental pollution results from the release of substances and energy from the waste products of human activities.

Pollution is classified based on the medium through which pollutants are transported. The four main types are air pollution, water pollution, land pollution, and noise pollution.

The degradation of water quality is primarily caused by its indiscriminate use due to increasing population and industrial expansion. Human activities are the main cause, with industry being the most significant contributor.

Major industries that contribute significantly to water pollution include leather, pulp and paper, textiles, and chemicals.

Contaminated water is a source of various water-borne diseases such as diarrhea, intestinal worms, and hepatitis. The WHO notes that about one-fourth of communicable diseases in India are water-borne.

The Union Government launched the 'Namami Gange Programme' to clean and protect the Ganga river by developing sewerage treatment systems, monitoring industrial effluents, and creating public awareness.

The main sources of air pollution are the combustion of fossil fuels, mining, and industries. It causes respiratory, nervous, and circulatory diseases, and can also lead to acid rain and urban smog.

Noise pollution is an unbearable level of noise from sources like factories, construction, automobiles, and aircraft. Its intensity is measured in decibels (dB) and it is often location-specific.

Urban waste disposal is a serious problem in India due to overcrowding and inadequate facilities. In many cities, 30 to 50 percent of the waste generated is left uncollected, leading to health hazards.

Solid waste from domestic and industrial establishments can cause health hazards by creating obnoxious smells and harboring carriers of diseases like typhoid, diphtheria, and cholera.

Rural to urban migration is caused by push and pull factors, such as low job opportunities in rural areas and the perceived high demand for labor and better livelihood in urban centers.

Slums are residential areas characterized by dilapidated houses, poor hygienic conditions, overcrowding, and a lack of basic amenities like drinking water, light, and toilet facilities.

Slum populations often work in low-paid, high-risk unorganized sectors, are undernourished, prone to diseases, and cannot afford proper education for their children.

Dharavi in Mumbai, considered Asia's largest slum, is a case study that highlights extreme poverty and poor living conditions, while also being a hub for various valuable small-scale industries.

Land degradation is a decline in the productive capacity of land, caused by natural processes like soil erosion or human activities like deforestation, mining, and faulty agricultural practices.

Jhabua district in Madhya Pradesh provides a successful model of reversing land degradation through watershed management programs, which involved community participation in resource management.