The detrimental effects of air and water pollution cannot be underestimated, and new discoveries about the nature and extent of pollution-related damages are constantly being made.
Human Health Effects of Air Pollution
People exposed to high enough levels of air pollutants can experience eye, nose, and throat irritation, breathing difficulties, worsening of existing lung and heart problems such as asthma, and increased risk of heart attack. Additionally, long-term exposure to air pollution can cause cancer and damage to the immune, neurological, reproductive, and respiratory systems. Children, the elderly, and people who are active outdoors may be more sensitive and can have more severe reactions to air pollution. The result is increased medication use, increased doctor and emergency room visits, more hospital admissions, and even premature death.
Environmental Effects of Air Pollution
Air pollution can cause a variety of environmental effects. Acid rain is precipitation that contains harmful amounts of nitric and sulfuric acids; the concentration of these acids is related to the burning of fossil fuels. The acids fall to Earth as wet precipitation (rain, snow, or fog) or dry precipitation (gas and particulates). Acid rain damages trees and causes soils and bodies of water to acidify, making the water unsuitable for fish and wildlife. It also speeds the decay of buildings, statues, and sculptures. Acid rain itself does not harm humans; however, the pollutants that cause acid rain damage human health.
Ozone is a gas that occurs both at ground-level and in the Earth’s stratosphere.
At ground level, ozone is a pollutant that can harm human health. In the stratosphere, ozone forms a protective layer that protects life on earth from the sun’s harmful ultraviolet rays. The use of certain man-made chemicals such as chlorofluorocarbons, hydrochlorofluorocarbons, and halons, which are used in coolants, foaming agents, solvents, and pesticides, leads to the depletion of the protective ozone layer. Thinning of the ozone layer allows increased amounts of ultraviolet radiation to reach the ground level of the Earth and potentially leads to more cases of skin cancer, cataracts, and impaired immune systems.
The Earth’s atmosphere contains a balance of naturally occurring gases that trap some of the sun’s heat near the Earth’s surface. This is called the “greenhouse effect” and it keeps the Earth’s temperature stable. However, evidence is mounting that human activities have disturbed the natural balance of gases by producing large amounts of some of the greenhouse gases such as carbon dioxide and methane. As a result, the atmosphere seems to be trapping more of the sun’s heat, causing global warming. Most scientists agree that global warming will have significant impacts on not only human health, but also on agriculture, water supplies, forests, and wildlife.
Air Pollution Case Study: Delhi
Delhi, the capital of India, is notorious for its poor air quality, sometimes thought to be among the worst for any major city in the world. Air pollution in India is attributed to industrial and vehicular emissions as well as its dependence on fossil fuels, and it has the world’s highest death rate from chronic respiratory diseases and asthma. Air quality is expressed by the “PM10” index, which refers to particulate matter less than 10 micrometers in diameter, and “PM 2.5,” which refers to particulate matter less than 2.5 micrometers in diameter. Both pose significant health risks, as the particles penetrate the lungs and affect all body systems. On September 21, 2018, Delhi’s air quality showed a measurement of “143 PM2.5, PM10,” a pollution level expressed as being “moderate.”
Human Health Effects of Water Pollution
Water pollution results in degraded water quality and purity that can pose serious health risks for humans. Polluted water can cause excessive algae to grow. Drinking water that is affected by a harmful algal bloom can cause serious health problems including rashes, stomach or liver illnesses, respiratory problems, and neurological effects. Infants who drink water contaminated by high levels of nitrates, a compound found in fertilizers, can become seriously ill and die. Direct contact with polluted water through swimming in contaminated water sources can expose swimmers to harmful pathogens that can lead to rashes, infections, and gastroenteritis. Impure drinking water can cause deadly outbreaks of cholera, hepatitis A, and diarrhea.
Environmental Effects of Water Pollution
The effects of water pollution depend on what pollutants are dumped and where they are deposited. Most water bodies near urban areas, as well as many coastlines, are heavily polluted. Water pollution can cause mass poisonings and death of aquatic animals, such as fish, crabs, birds, and dolphins. Polluted waters can destroy ecosystems through excessive algae growth. These disruptions lead to greater disturbances in the natural food chain that adversely alter the existences of creatures that live on or near the water. Humans who eat poisoned seafood can contract life-threatening diseases such as hepatitis.