1. Air Episodes and Sources of Air PollutionBy
Mohammad Shahid Arshad
Assistant Professor
Civil Engineering Department
ACET

2. Topics History of Air Pollution Air Pollution Episodes Air Pollutants
Effects of Air Pollutants

3. History of Air Pollution
’s Air Pollution Episodes
1955 First Federal Air Pollution Control Act - funds for research
1960 Motor Vehicle Exhaust Act - funds for research
1963 Clean Air Act
Three stage enforcement
Funds for state and local agencies

4. Control technique documents 1970 clean Air Act Amendments
1965 Motor Vehicle Air Pollution Control Act-Emission regulations for cars to begin in 1968
1967 Air Quality Act
Criteria documents
Control technique documents
1970 clean Air Act Amendments
National Ambient Air Quality Standards
New Source Performance Standards

6. Introduction
Population increases rapidly after the Industrial revaluation.
Pollution become more intense as emission from homes and factories increased.
It was not noticed that serious health damage might be observed in population exposed to air pollutants emitted from the industrial activity until several air pollution episode had occurred.
The disasters may cause deleterious genetic effects in addition to gobal problem.

7. Air Pollution Episodes
1873 London, England
1911 London, England
DEC 1930 Meuse Valley, Belgium
JAN 1931 Manchester and Salford, England
OCT 1948 Donora
DEC 1952 London, England
OCT 1953 New Orleans, LA
NOV 1953 New York, NY
JAN 1956 London, England
1960 NYC

8. London, England (1873,74,1911,31,52,56)
London is famous for its smoky, dirty skies and “pea-soup” nights wrapped in heavy fog.
During this winter, the fog lasted from November to February.
In the week following the worst of it, deaths rose 75%.
Key ingredients - calm winds, fog, smoke particles from coal burning
1873 and deaths
deaths
deaths

9. Cont…
On Dec a high temp. inversion as a result of which a white fog blanketed London from 5th dec. to 8 th dec.
The subsidence inversion did not allow the pollutants to disperse as a result of which the fog become black.
The smog was intensely irratating to the human respiratory system and the people soon developed red eye, burning throat and nagging coughs.

10. There will be no movement of air and the visibility was zero.
Cont…
It was said that the fog become so black that white shirt become almost black within 20 min.
There will be no movement of air and the visibility was zero.

11. Meuse Valley, Belgium (1930, December 2-5)

12. Cont…
In Dec 1930, an anticyclone (high pressure area) blanketed Belgium, resulting in fog and temp. inversion in Meuse Valley. In 25 km length, with the hills of m high on either side there are many industrial plant.
Thermal inversion did not allow the pollutants to disperse and for three days continuously area was under thick cover of smog that contain several pollutants mainly SO2, NO2, SPM, metallic fumes.
Mixture of SO2 and NO2 aerosols was believed to be main pollutant responsible for disaster.
Due to building up of very high ground level concentration of pollutants in the abnormal weather about 60 died and about 6000 became ill.
Symptoms were Cough, irritation of eyes, nose and throat, shortness of breath, nausea and vomiting. Thousands of cattle also died.
Elder people already suffering from chronic diseases were the most affected.

13. Donora, Pennsylvania, USA (1948, October 30-31)
In Oct in donora anticyclonic weather condition with no air movement, temp. inversion due to sea breeze conditions, and the winter fog did not allow the air pollutants to disperse for four days.
SO2 (0.5-2 ppm) and the particulate matter are to be main pollutants responsible for disaster.
Out of 14,000 60% become ill, 10% were severely affected and 20 person died.
Symptoms include irritation of eye, nose and throat, cough, headache, vomiting and irritation of respiratory track.
The black mixture of pollutants was so concentrated with gas and soot that one can even taste it.
10 year latter affected donora residence were found to have the higher rate of sickness and to die at an early age.

14. OCT 1953 New Orleans, LA
It result from more or less permanent high pressure area.
Ozone is formed by the photo chemical reaction of oxide N2 and HC
NO2 absorb solar energy and break into oxygen atom and nitric acid, and O2 is again combine with the oxygen to form ozone.
Temp. inversion increases the concentration of exhaust gases and photochemical smog is formed.
The physical difficulties caused by smog are irration of eye, throat etc.
Subsidence inversion is responsible for the air pollution problem in los angle.

15. Bhopal (India)
Bhopal gas tragedy was a gas leak incident in considered one of the world's worst day.
It occurred on the night of December 2–3
1984 at the Union Carbide India Limited (UCIL) pesticide plant.
A leak of methyl isocyanate gas and other chemicals from the plant.

16. Cont…
Other factors identified by the inquiry included: use of a more dangerous pesticide manufacturing method, large-scale MIC storage, plant location close to a densely populated area, undersized safety devices, and the dependence on manual operations
Plant management deficiencies were also identified – lack of skilled operators, reduction of safety management, insufficient maintenance, and inadequate emergency action plans.
The initial effects of exposure were coughing, vomiting, severe eye irritation and a feeling of suffocation.

17. Cont…
170,000 people were treated at hospitals and temporary dispensaries. 2,000 buffalo, goats, and other animals were collected and buried. Within a few days, leaves on trees yellowed and fell off. Fishing was prohibited causing further supply shortages.

18. Cont…
The acute symptoms were burning in the respiratory tract and eyes, breathlessness, stomach pains and vomiting. The causes of deaths were choking reflexogenic circulatory collapse and pulmonary oedema. The stillbirth rate increased by up to 300% and neonatal mortality rate by 200%.
It is estimated 1,00,000 to 2,00,000 people have permanent injuries. Reported symptoms are eye problems, respiratory difficulties, immune and neurological disorders, cardiac failure secondary to lung injury, female reproductive difficulties and birth defects among children born to affected women.

19. Poza Rica (Mexico)
On Nov , it was seriously affected by an accident spillage of hydrogen sulphide gas.
The situation was complicated by weather inversion associate with the little latter air movement.
The effect of gas were those characteristics of H2S inhalation
The incident cause the illness of 320 person and 22 died.
Symptoms are loss of sense, smell, cough, cough, iratiation, nausea.
All people get affected.

20. SOURCESS OF AIR POLUTION

21. Classified as : Primary and secondary Natural and manmade
Stationary and mobile

22. According to origin
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight;
NO2, which is formed as NO combines with oxygen in the air;
Acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.

24. Natural and Manmade Natural : Pollen and other aero-allergens
Sea salt nuclei
Smoke, fly ash and gases from forest fires
Microorganism
Gases and odors from swamps and marshes
Fog
Volcanic ash and gases
Natural radioactivity
Ozone from lighting and ozonosphere 
Meteorite dust
Natural Hazes

25. Cont…

26. Electronic appliances Smoke Use of chemical Plastics
Cont…
Manmade :
Automobiles
Pesticides
Insecticides
Electronic appliances
Smoke
Use of chemical
Plastics
Particulate matter

27. Cont…

28. Cont…

29. Effects of Air Pollution

30. Human Health Effects
Exposure to air pollution is associated with numerous effects on human health, including pulmonary, cardiac, vascular, and neurological impairments.
The health effects vary greatly from person to person. High-risk groups such as the elderly, infants, pregnant women, and sufferers from chronic heart and lung diseases are more susceptible to air pollution.
Children are at greater risk because they are generally more active outdoors and their lungs are still developing.

31. Cont…
Exposure to air pollution can cause both acute (short-term) and chronic (long-term) health effects.
Acute effects are usually immediate and often reversible when exposure to the pollutant ends. Some acute health effects include eye irritation, headaches, and nausea.
Chronic effects are usually not immediate and tend not to be reversible when exposure to the pollutant ends.
Some chronic health effects include decreased lung capacity and lung cancer resulting from long-term exposure to toxic air pollutants.

32. Effects on Human respiratory system
Cont…
Both gaseous and particulate air pollutants can have negative effects on the lungs.
Solid particles can settle on the walls of the trachea, bronchi, and bronchioles.
Continuous breathing of polluted air can slow the normal cleansing action of the lungs and result in more particles reaching the lower portions of the lung. .

33. Health Effects
Acute sickness or death.
Insidious or chronic disease, shortening of life or impairment of growth.
Alteration of important physiological functions, such as ventilation of the lung transport of oxygen by hemoglobin or various functions of the nervous system.
Unpleasant odor, impairment of visibility or other effects sufficient to lead individuals to change residence or place of employment.
Air pollution is known to be a causal factor in chronic pulmonary diseases like lung cancer, bronchitis, emphysema, and asthma.
Aggravation of existing cardiovascular disease.
Eye and respiratory tract irritation, headache, dizziness, visual disorders, and memory impairment are among the immediate symptoms that people have experienced soon after exposure to some organic compounds.

34. Cont…
Damage to the lungs from air pollution can inhibit this process and contribute to the occurrence of respiratory diseases such as bronchitis, emphysema, and cancer

35. Table 1:  Sources, Health and Welfare Effects for Criteria Pollutants.
Description
Sources
Health Effects
Welfare Effects
Carbon Monoxide (CO)
Colorless, odorless gas
Motor vehicle exhaust, indoor sources include kerosene or wood burning stoves.
Headaches, reduced mental alertness, heart attack, cardiovascular diseases, impaired fetal development, death.
Contribute to the formation of smog.
Sulfur Dioxide (SO2)
Colorless gas that dissolves in water vapor to form acid, and interact with other gases and particles in the air.
Coal-fired power plants, petroleum refineries, manufacture of sulfuric acid and smelting of ores containing sulfur.
Eye irritation, wheezing, chest tightness, shortness of breath, lung damage.
Contribute to the formation of acid rain, visibility impairment, plant and water damage, aesthetic damage.
Nitrogen Dioxide (NO2)
Reddish brown, highly reactive gas.
Motor vehicles, electric utilities, and other industrial, commercial, and residential sources that burn fuels.
Susceptibility to respiratory infections, irritation of the lung and respiratory symptoms (e.g., cough, chest pain, difficulty breathing).
Contribute to the formation of smog, acid rain, water quality deterioration, global warming, and visibility impairment.
Ozone (O3)
Gaseous pollutant when it is formed in the troposphere.
Vehicle exhaust and certain other fumes.  Formed from other air pollutants in the presence of sunlight.
Eye and throat irritation, coughing, respiratory tract problems, asthma, lung damage.
Plant and ecosystem damage.
Lead (Pb)
Metallic element
Metal refineries, lead smelters, battery manufacturers, iron and steel producers.
Anemia, high blood pressure, brain and kidney damage, neurological disorders, cancer, lowered IQ.
Affects animals and plants, affects aquatic ecosystems.
Particulate Matter (PM)
Very small particles of soot, dust, or other matter, including tiny droplets of liquids.
Diesel engines, power plants, industries, windblown dust, wood stoves.
Eye irritation, asthma, bronchitis, lung damage, cancer, heavy metal poisoning, cardiovascular effects.
Visibility impairment, atmospheric deposition, aesthetic damage.

36. Pollutants Sources Effects on Vegetables Aldehydes
Photochemical reactions
The upper portions of Alfalfa etc. will be affected to Narcosis if 250 ppm of aldehydes is present for 2 hrs duration.
Ozone (O3)
Photochemical reaction of hydrocarbon and nitrogen oxides from fuel combustion, refuse burning, and evaporation from petroleum products.
All ages of tobacco leaves, beans, grapes, pine, pumpkins and potato are affected. Fleck, stipple, bleaching, bleached spotting, pigmentation, growth suppression, and early abscission are the effects.
Peroxy Acetyl Nitrate (PAN)
The sources of PAN are the same as ozone
Young spongy cells of plants are affected if 0.01 ppm of PAN is present in the ambient air for more than 6 hrs.
Nitrogen dioxide (NO2)
High temperature combustion of coal, oil, gas, and gasoline in power plants and internal combustion engines.
Irregular, white or brown collapsed lesion on intercostals tissue and near leaf margin. Suppressed growth is observed in many plants.
Ammonia & Sulfur dioxide
Thermal power plants, oil and petroleum refineries.
Bleached spots, bleached areas between veins, bleached margins, chlorosis, growth suppression, early abscission, and reduction in yield and tissue collapse occur.
Chlorine (Cl2)
Leaks in chlorine storage tanks, hydrochloric acid mists.
If 0.10 ppm is present for at least 2 hrs, the epidermis and mesophyll of plants will be affected.
Hydrogen fluoride, Silicon tetrafluoride
Phosphate rock processing, aluminum industry, and ceramic works and fiberglass manufacturing.
Epidermis and mesophyll of grapes, large seed fruits, pines and fluorosis in animals occur if ppm of HF is present for 5 weeks.
Pesticides & Herbicides
Agricultural operations
Defoliation, dwarfing, curling, twisting, growth reduction and killing of plants may occur.
Particulates
Cement industries, thermal power plants, blasting, crushing and processing industries.
Affects quality of plants, reduces vigor & hardness and interferences with photosynthesis due to plugging leaf stomata and blocking of light.
Mercury (Hg)
Processing of mercury containing ores, burning of coal and oil.
Greenhouse crops, and floral parts of all vegetations are affected; abscission and growth reduction occur in most of the plants.

37. In addition VOCs are listed as common air pollutant causing smog.
Common Air Pollutants
US EPA identified Criteria Pollutants based on their health impacts. These are Sulphur Dioxide Nitrogen Oxides, Particulate Matter, Carbon Monoxide and Ozone.
In addition VOCs are listed as common air pollutant causing smog.
EPA prescribes Primary Standards to protect health and Secondary Standards prevent environmental & property damage.

38. Effects of Air Pollutants

40. SO2 : Burning of fuel, Industrial Processes
Nox : Burning of gasoline, natural gas, coal, oil etc, Vehicle exhaust, Power Stations
SPM : Burning of fuel, Vehicle exhaust, Industrial sources, burning of Refuge, re-suspension of dust
CO : Burning of gasoline, natural gas, coal, oil etc.
Lead : Leaded gasoline, paint, smelters, Manufacturing of Lead storage batteries
Ozone: Chemical reaction of pollutants, VOCs and Nox in the presence of heat and sunlight.
VOCs: Released from burning fuel (including Natural Gas), solvents, paints, glues. Cars are important source of VOCs