Economic Losses as Air Pollution Effects

Apart from direct health-related and other environmental issues, air pollution brings with it economic losses as well.

Some of the economic losses caused by air pollution are as follows (80):

Downtown Los Angeles Smog 
Photo: Jami Dwyer

• Direct medical losses
• Lost income from being absent from work
• Decreased productivity
• Travel time losses due to reduced visibility
• Losses from repair of damage to buildings
• Increased costs of cleaning
• Losses due to damage to crops & plants

For example, experts calculated that California is losing $28 billion every year in health care costs, school absences, missed work and lost income potential from premature deaths, because of air pollution in Southern California and in the San Joaquin Valley. (81)

We can only imagine the economic losses incurred by developing countries such as China, where air pollution levels are among the highest in the world.

Leia Mais…

Air Pollution Effects On Other Living Things

Air Pollution Effects on Animals

We don’t know a lot about air pollution effects on animals.

• Probably one of the best examples here is that of acid rain and how it affects freshwater animal life.

Hope this rain is not acidic
Photo: Heather Dietz

Sulfur dioxide and nitrogen dioxide are transformed in the atmosphere to produce acid compounds – sulfuric and nitric acids. These compounds then fall back on to the ground as particulates or raindrops – in other words, acid rain.

So acid rain also falls on streams and lakes, acidifies them and destroys fish life in these freshwater ecosystems. (58)

For example, in Sweden acid rain made over 18,000 lakes so acidic that all the fish died out. (59) Salmon species appear to be particularly sensitive to acidity. (60)

Some other populations of animals in Europe and North America that have also been declining due to acid rain are brown trout, mayfly larvae, beetle larvae, mollusks, and aquatic bird species (ex., the dipper). (61)

• Pollution may also affect animals through plants on which they feed.

For example, pea aphids feed on pea plants exposed to sulfur dioxide in the air. High exposure to sulfur dioxide negatively affects the health of the pea plants, and therefore, the health of the aphids as well. (62)

Some other examples of air pollution effects on animals:

• Excessive ultraviolet radiation coming from the sun through the ozone layer in the upper atmosphere which is eroded by some air pollutants, may cause skin cancer in wildlife (63)

• Tropospheric ozone may damage lung tissues of animals (64)

It is also probably logical to assume that many higher order animals (especially those closely related to humans, ex. mountain gorillas) experience air pollution effects similar to those experienced by humans.

Air Pollution Effects on Forests, Trees & Plants

Air pollution can have both long-term and short-term effects on plants.

• Physical injury to leaves is the immediate effect of air pollution on plants. Here is how leaves are affected by different air pollutants (65):

• Ozone produces a speckle of brown spots, which appear on the flat areas of leaf between the veins
• Sulfur dioxide: larger bleached-looking areas
• Nitrogen dioxide: irregular brown or white collapsed lesions on intercostal tissue and near the leaf edge
• Ammonia: unnatural green appearance with tissue drying out

Trees Damaged by Sulfur Emissions Czech Republic  Photo: Wikimedia Commons
• Of all main air pollutants, sulfur dioxide often comes up as the one that most negatively affects plants & trees.

  Here is a very illustrative example of how destructive sulfur dioxide can be to vegetation.

  The development of ore deposits in Canada in the middle of the 20 th century was a major source of sulfur dioxide emissions in high concentrations.

  Sulfur emissions of one specific iron smelting plant in Wawa, Ontario, caused the destruction of large tracts of native boreal forest (spruce, cedar, larch and pine), in a belt stretching some 30 km from the smelter. (66)

  Another good example is that of the Black Triangle – the area where the borders of Germany, Poland and the Czech Republic meet, with significant brown coal deposits.

  Industrial activity in this area led to high sulfur emissions which resulted in devastation of many square kilometers of forest (incl. the Norway spruce forest), particularly above an altitude of 750 m. (67)

However, it has been noted that sulfur dioxide concentrations in the atmosphere have recently been significantly reduced almost throughout the world (68) and do not carry such dramatic effects as they used to during the 20th century.

Lichens are considered to be most sensitive to sulfur dioxide. During the period of high levels of sulfur pollution, large parts of Europe lost many species of lichen and became known as “lichen deserts”. But as sulfur pollution levels dropped, many lichen species re-appeared. (69)

Sulfur dioxide may also affect higher plants, including wild species, crops and trees (though some species may develop sulfur dioxide tolerant populations in response to long-term exposure).

These effects may be (70):

• Cell metabolism disruption (membrane damage, respiration and photosynthetic effects)
• Leaf injury and loss
• Reduced growth and reproduction
• Increase in susceptibility of plants to attacks by insect herbivores
• Nitrogen dioxide , another air pollutant, may act in synergy with sulfur dioxide to produce a negative effect on plants’ photosynthesis. (71)

• Tropospheric ozone can prevent plant respiration by blocking stomata and negatively affecting plants’ photosynthesis rates which will stunt plant growth; ozone can also decay plant cells directly by entering stomata. (72)

• Particles, just like ozone, often affect plants & trees via blocking of leaf stomata through which plants undertake the gas exchange necessary for photosynthesis and respiration. (73)

Andrew Farmer notes that:

“In sufficient quantities, dusts [i.e. particles] may form a smothering layer on leaves, reducing light and hence lowering photosynthetic rates.

Trees in a Cement Factory, Brazil 
Photo: Darlan Cunha

Many dusts are inert and so only act by shading.

However, some dusts are also chemically active.

Thus cement dust will also dissolve leaf tissue, resulting in additional injury.

Coal dust may also contain toxic compounds.

Dusts may also affect ecosystems through their action on soil. Thus the alkaline chemistry of limestone dusts can raise the soil pH of acid and neutral habitats, resulting in the loss of plant and animal species.” (74)

So, particulate air pollution effects on plants & trees may be as follows (75):

• Blocked stomata
• Increased leaf temperature
• Reduced photosynthesis
• Reduced fruit set, leaf growth, pollen growth
• Reduced tree growth
• Leaf necrosis and chlorosis, bark peeling

• Acid rain (a product of air pollution) severely affects trees and plants as well.

It can kill trees, destroy the leaves of plants, can infiltrate soil by making it unsuitable for purposes of nutrition and habitation. (76)

It is also associated with the reduction in forest and agricultural yields. (77)

Air Pollution Effects on Wider Environment

The effects of acid rain have been known for a long time.

Though experts admit that the problem of acid rain is generally under control, it’s still worth reiterating the effects brought on by acid rain on the wider environment.

Acid rain has adverse effects on (78):

• Forests & other vegetation
• Freshwater lakes & streams destroying aquatic life
• Soil
• Buildings & materials

Air pollution also has a negative impact on visibility. (79)

Source: http://www.tropical-rainforest-animals.com/air-pollution-effects.html

Leia Mais…

Air Pollution Effects On Humans

Air Pollution Effects: Sulfur Dioxide

Sulfur dioxide (SO2) is a colorless gas with a pungent, suffocating odor. SO2 is corrosive to organic materials and it irritates the eyes, nose and lungs; therefore it is quite a dangerous air pollutant. (4)

Coal Power Plant, USA 
Photo: Wigwam Jones

Sulfur is contained within all fossil fuels, and is released in the form of sulfur dioxide during fossil fuel combustion.

Because of the widespread use of fossil fuels, sulfur dioxide is among the most common air pollutants produced in every part of the planet.

Sulfur dioxide may often act in synergy with other pollutants (ex., airborne particles) to produce certain air pollution effects.

Let’s summarize some sulfur dioxide pollution effects on human health (5, 6, 7):

• Irritation of eyes, nose, throat; damage to lungs when inhaled
• Acute and chronic asthma
• Bronchitis and emphysema (as a result of synergy between SO2 and suspended particulate matter)
• Lung cancer

Air Pollution Effects: Nitrogen Dioxide

Nitrogen dioxide (NO2) is a gas of reddish-brown color with a distinct sharp, biting odor. It is often analyzed in conjunction with another nitrogen gas – nitric oxide (NO). Together these two gases are referred to as NOx.

Ho Chi Minh Traffic 
Photo: Graham of Flickr.com

Combustion of fossil fuels always produces both NO2 and NO.

But almost 90% of the NOX combustion product is in the form of NO which is then oxidized to NO2 in the air. (12, 13)

NOx can destroy organic matter, ex. human tissue. Exposure to high concentrations of NOx can make living organisms more susceptible to bacterial infections and lung cancer. (14)

Just like other pollutants, nitrogen dioxide affects people with existing medical conditions more severely than healthy people.

For example, asthma sufferers may experience enhanced sensitivity after short-term NO2 exposure as compared to those without any asthmatic problems. (15)

Another group at higher risk is children. For instance, children aged 12 and younger who are exposed to NOx suffer more respiratory illness than the ones who are not exposed. (16)

Depending on different NO2 concentrations in the air, nitrogen dioxide pollution effects may be as follows (17, 18):

• Increased incidence of respiratory illness
• Increased airway resistance (due to inflammation)
• Damage to lung tissue
• Chronic obstructive pulmonary disease, or COPD (narrowing of the airways)
• Emphysema (as part of COPD)
• Pulmonary edema (accumulation of excessive fluid in the lungs)
• Infant and cardiovascular death

It is important to note that nitrogen dioxide is a major component of the photochemical smogand thus a contributor to the formation of ozone which is another serious air pollutant. See more about effects of ozone here.

Air Pollution Effects: Carbon Monoxide

Carbon monoxide (CO) is an extremely toxic gas which affects the ability of the body to receive oxygen. Hemoglobin which transports oxygen in the blood is bound by carbon monoxide, which leads to the shortage of oxygen in the body. (19)

Carbon monoxide is the most common type of fatal poisoning in many countries around the world. (20)

Unlike many other air pollutants, carbon monoxide does not directly affect eyes, nasal passages or lungs. (21)

Exposure to carbon monoxide may lead to (22, 23, 24):

Kathmandu Pollution 
Photo: Lukasz Z

• Toxicity of the central nervous system and heart
• Headaches, dizziness, nausea and unconsciousness
• Loss of vision
• Decreased muscular coordination
• Abdominal pain
• Severe effects on the baby of a pregnant woman
• Impaired performance on simple psychological tests and arithmetic; loss of judgment of time
• In cases of prolonged exposure to high CO concentrations, unconsciousness, convulsions and death would occur

Carbon monoxide pollution effects are exacerbated in weaker people, specifically in those with heart and lung diseases. (25)

What makes this gas even more dangerous is the fact that it is invisible and odorless, and thus not immediately detectable as a hazard.

Air Pollution Effects: Ozone Effects

Ozone (O3) is a poisonous gas with a sharp and cold odor.

It can be found in the stratosphere where it occurs naturally and plays a beneficial role by protecting the Earth from ultraviolet sunlight; and in the troposphere where it occurs naturallyand also forms part of the human-caused photochemical smog.

It is of course the tropospheric ozone that we are interested in as an important air pollutant.

The chemical reaction between nitrogen oxides and volatile organic compounds (VOCs) in the presence of sunlight results in the photochemical smog; the tropospheric ozone is an end product of this reaction and a component of the smog itself.

Santiago Smog 
Photo: Phil Whitehouse

Because the photochemical smog requires a lot of sunshine to form, it occurs mostly in sunny and heavily polluted places, such as Los Angeles, Mexico City and even Athens.

Ozone’s main “victim” within the human body is its respiratory system.

Once in the lungs, ozone burns through cell walls. The immune system fails to protect the lungs because ozone pushes the defensive cells back. As cellular fluid starts seeping into the lungs, breathing becomes rapid, shallow and painful. (26)

Exposure to ozone over long periods of time leads to a stiffening of the lungs and a reduced ability to breathe. (27)

As an example, a study conducted in California in the 1980s shows that children living in ozone-polluted areas have smaller than normal lungs and adults lose up to 75% of their lung capacity. (28)

So, exposure to the tropospheric ozone may cause (29, 30, 31):

• Burning nose and watering eyes
• Tightening of the chest
• Coughing, wheezing and throat irritation
• Rapid, shallow, painful breathing
• Susceptibility to respiratory infections
• Inflammation and damage to the lining of the lungs
• Aggravation of asthma
• Fatigue
• Cancer

Air Pollution Effects: Ammonia Effects

Ammonia is a colorless, pungent, hazardous caustic gas composed of nitrogen and hydrogen.

Though ammonia is used for different applications in many sectors, agriculture is its largest consumer and producer.

Livestock farming, animal waste and fertilizer application are the biggest sources of atmospheric ammonia emissions within the agricultural sector.

Gaseous ammonia is a dangerous air pollutant. Breathing in large amounts can cause death. (32)

So, ammonia pollution effects are (33, 34, 35):

On the respiratory system :

Ammonia Fertilization
Australia, c. 1975 
Photo: Rae Allen

• Nose & throat irritation and burns (their severity increasing with the increased ammonia concentrations)
• Swelling of the throat and airways; airways destruction
• Pulmonary edema
• Chronic lung disease
• Cough
• Asthma
• Lung fibrosis
• Inhaling large amounts of ammonia can be fatal

On the skin & eyes :

• Skin burns
• Skin conditions, ex. dermatitis
• Burning sensation in the eyes
• Ulceration & perforation of the cornea (can occur months after exposure); blindness
• Cataracts & glaucoma

Air Pollution Effects: Volatile Organic Compounds

Volatile organic compounds (VOCs) are defined as organic compounds which easily evaporate and enter the atmosphere.

VOCs are important pollutants for two reasons.

First , they are precursors to the formation of ozone (which is part of the photochemical smog); second, they include compounds which are carcinogenic and mutagenic in their own right. (37)

Oil is a source of VOCs 
Photo: Jay-P

Typical VOCs include propane, benzene, ethanol, methanol, ether, carbon tetrachloride and vinyl chloride; substances such as petrol and resins contain many individual VOCs, and many others are produced during combustion processes. (38)

Toxicity of some VOCs and ensuing health effects are no doubt issues of serious concern.

For example, exposure to benzene and 1,3-butadieneis a suspected cause of around 10% of leukemia incidence in the UK. (39)

Exposure to toluene – another dangerous VOC – may lead to the dysfunction of the central nervous system resulting in behavioral problems, memory loss and disturbance of the circadian rhythm (40); toluene is also suspected to cause cancer (41).

Some other VOCs, ex. carbon tetrachloride and PCBs, are believed to produce abnormal changes in fetus development (42) and consequently lead to birth defects. Carbon tetrachloride also leads to liver damage (43).

Vinyl chloride causes Raynaud's phenomenon (spasms in the small arteries that cause the extremities to become pale and cold, as well as painful), necrosis of the small bones of the hand, liver damage, and a rare, highly malignant tumor of the liver. (44)

Benzene pollution effects on human health (45):

• Short-term breathing of low levels of benzene can cause drowsiness, dizziness, rapid heart rate, headaches, tremors, confusion and unconsciousness; exposure to high levels of benzene may result in death
• Chronic effects:
• Damage to the bone marrow
• Decrease in red blood cells (anemia)
• Excessive bleeding and depression of the immune system increasing the risk of infection
• Leukemia

1,3-Butadiene pollution effects on human health (46):

• Short-term exposure to high levels of 1,3-butadiene may lead to distorted blurred vision, vertigo, general tiredness, decreased blood pressure, headache, nausea, decreased pulse rate, and fainting
• Long-term exposure to high levels can increase the risk of cardiovascular diseases and cancer

Let us summarize some effects of VOCs on human health:

• Tiredness, vertigo, drowsiness, dizziness, nausea, confusion, unconsciousness
Tiredness 
• Anemia
• Bone marrow damage
• Liver damage
• Dysfunction of the central nervous system:
• Behavioral problems
• Memory loss
• Disturbance of the circadian rhythm
• Cardiovascular diseases
• Cancer; specifically leukemia
• Abnormal changes in fetus development, birth defects
• VOCs also contribute to sick building syndrome indoors
• As facilitators in ozone formation, VOCs may indirectly contribute to respiratory problems

Air Pollution Effects: Airborne Particles

Airborne particles are tiny fragments of solid or liquid nature suspended in the air (which are called aerosols).

Particles may be primary – when emitted into the atmosphere directly by sources, or secondary– when formed in the atmosphere through the interaction of primary pollutants.

For example, sulfur oxides and nitrogen oxides are primary pollutants which may transform in the air into sulfates and nitrates. (47)

Soot Pollution, England 
Photo: Owen Benson

Dust particles are solid particles between 1 and 100 μm (micrometres) in diameter; fumes, or smoke, are solid particles less than 1 μm in diameter.

Experts believe that dust is the most damaging among all widely measured air pollutants. (48)

Smaller dust particles are more dangerous than larger ones because they can penetrate deep into the lungs being deposited on areas where the body’s natural clearance mechanisms such as coughing cannot remove them. (49)

Combustion of fossil fuels by road transport, power plants etc. is a major source of particulate air pollution.

Particles may come in a whole variety of chemical compositions including heavy metals such as cadmium, mercury and lead. (50)

They often act in synergy with other air pollutants, ex. sulfur dioxide, to produce negative health effects in humans.

As particulate pollution levels rise, it is common to see an increase in hospital admissions for (51):

• Stuffy noses, sinusitis
• Sore throats
• Wet cough, dry cough, phlegm
• Head colds
• Burning eyes
• Wheezing; shortness of breath
• Lung disease
• Chest discomfort or pain

As with other pollutants, children are of course more susceptible to particulate pollution.

Specific children’s disorders caused by airborne particles may include (52, 53, 54):

• Infant death
• Low birth weight
• Reduced lung function

Protection from Pollution
Los Angeles 
Photo: Dave Blume

Here is a summary of the particulate pollution effects provided by the US Environmental Protection Agency (55):

• Increased respiratory symptoms (ex. irritation of the airways, coughing, difficulty breathing)
• Decreased lung function
• Aggravated asthma
• Chronic bronchitis
• Irregular heartbeat
• Nonfatal heart attacks
• Premature death in people with heart or lung disease

Indeed, particulate pollution affects both developed and developing countries:

• For example, a major study conducted in the US between 1982 and 1989 found that people living in American cities with the highest levels of particulate air pollution were 15% to 17% more likely to die one to three years early (56)
• In another example, particulate air pollution is linked to nearly 350,000 premature deaths in China and India every year (57)

Leia Mais…

What Causes Air Pollution

Air pollution is caused by the existence of chemicals in the atmosphere. The interference of these pollutant substances is harmful for human health and has varying effects on the environment. Toxic or radioactive gases are the most dangerous and cause the maximum air pollution other than these vehicles too cause the maximum air pollution.

Air pollution also causes the green house effect, the greenhouse effect occurs due to the increasing amount of carbon dioxide in the upper atmosphere.

Maximum amount of air pollution is caused by vehicles like cars and trucks. According to the 'World Health Organisation' nearly 4.7 people die every year due to the effects caused by air pollution.

Industrial emission is another reason for the occurrence of SMOG. It is the largest type of air pollution. Metropolitan cities are mainly affected by smog, as they have a huge amount of industries and car population. 


Source: http://www.blurtit.com/q759125.html

Leia Mais…