Air pollutionAir pollution

Air pollutionAir pollutionAir PollutionAir Pollution is the human introduction into the is the human introduction into the

atmosphere of chemicals, particulates, or biological atmosphere of chemicals, particulates, or biological materials that cause harm or discomfort to humans materials that cause harm or discomfort to humans or other living organisms, or damage the or other living organisms, or damage the environment.[1] Air pollution causes deaths[2] and environment.[1] Air pollution causes deaths[2] and respiratory disease.[3] Air pollution is often respiratory disease.[3] Air pollution is often identified with major stationary sources, but the identified with major stationary sources, but the greatest source of emissions is actually mobile greatest source of emissions is actually mobile sources, mainly automobiles.[4] Gases such as sources, mainly automobiles.[4] Gases such as carbon dioxide, which contribute to global warming, carbon dioxide, which contribute to global warming, have recently gained recognition as pollutants by have recently gained recognition as pollutants by climate scientists, while they also recognize that climate scientists, while they also recognize that carbon dioxide is essential for plant life through carbon dioxide is essential for plant life through photosynthesis. photosynthesis.

SmogSmog

Smog is a kind of air pollution; the word Smog is a kind of air pollution; the word "smog" is a portmanteau of smoke and fog. "smog" is a portmanteau of smoke and fog. Classic smog results from large amounts of Classic smog results from large amounts of coal burning in an area and is caused by a coal burning in an area and is caused by a mixture of smoke and sulfur dioxide. mixture of smoke and sulfur dioxide.

Acid rainAcid rain

Acid rain can damage non-replaceable Acid rain can damage non-replaceable buildings, statues, and sculptures that are buildings, statues, and sculptures that are part of our nation’s memories that we want part of our nation’s memories that we want to last for a very long time.to last for a very long time.A very serious problem is the effect of acid A very serious problem is the effect of acid rain on trees.rain on trees.

Effects of acid rainEffects of acid rain

Acid rain problem across EuropeAcid rain problem across Europe

The Ozone Hole• For nearly a billion years, ozone molecules in the

atmosphere have protected life on Earth from the effects of ultraviolet rays.

• In the past 60 years human activity has contributed to the deterioration of the ozone layer. Scientists have discovered holes in the ozone layer, caused by substances called CFCs (chlorofluorocarbons).

• CFCs are used in refrigerators, aerosol cans and in the manufacture of some plastic products.

• In a year air travel releases 600 million tons of carbon dioxide into the atmosphere. By the year 2050, increased flights by jet airplanes will impact global climate through the greater number of contrails they will produce.

The Antarctic ozone hole

• CFCs are used in refrigerators, aerosol cans and in the manufacture of some plastic products.

• In a year air travel releases 600 million tons of carbon dioxide into the atmosphere. By the year 2050, increased flights by jet airplanes will impact global climate through the greater number of contrails they will produce.

The Antarctic ozone hole