air pollution
DESCRIPTION
Air pollution. Supervision P rof. Dr. Mervat Salah. Outcomes. 1-To know the meaning of air pollution 2-To differentiate between outdoor and indoor pollution 3-To know types of air pollution 4-To understand the ways to control air pollution. AIR POLLUTION. - PowerPoint PPT PresentationTRANSCRIPT
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Air pollution
SupervisionProf. Dr. Mervat Salah
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Outcomes
1-To know the meaning of air pollution2-To differentiate between outdoor and indoor pollution3-To know types of air pollution4-To understand the ways to control air pollution
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AIR POLLUTION
Type of pollution:- outdoor pollution – indoor pollution
Sources of out doorpollution
Combustion of fuel (natural gas, petroleum, coal and
wood) Industrial process Natural process (Volcanic)
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Carbon oxides (CO)
Nitrogen oxides and nitric acid (NO, HNO3)
Sulfur dioxide and sulfuric acid (SO2, H2SO4)
Particulates (SPM)
Ozone (O3)
Volatile organic compounds (VOCs)
)
Types of Major Air Pollutants
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Pollutants Pollutants can be classified as either primary or secondary- Primary pollutants are substances directly emitted from a process,
such as the carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories.
- Secondary pollutants are not emitted directly. Rather, they form in
the air when primary pollutants react or interact. An important example of a secondary pollutant is ground level ozone
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Sources and Types of Air Pollutants
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Environmental challenges
• Green house effect: Increasing global temperature. Scientists predicting that earth's temperature will increase by 3-40C by year 2030 if the pollution continues to increase at the same pace.
• Ozone depletion: As ozone layer in the upper
atmosphere absorbs incoming harmful ultraviolet radiation but it is now getting thinner & more UVs are reaching in to earth creating different disease like cancer& eye problems.
• Photochemical smog: In 1952 London was covered by smog for 10 days .This smog was caused by fog, smoke, ash,& SO2 plus NO2.Sunlight played a great role in the formation of this smog .Acid rain: is caused by oxides of nitrogen & sulphur.It increases acidity of soil & effects the growth of trees & plants.
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Acid Deposition• Sulfur dioxides and nitrogen oxides• Wet and dry deposition• Acid rain• Regional air pollution
– Midwest coal-burning power plants– Prevailing winds
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Fig. 15-4, p. 351
Lakes in deepsoil high in limestoneare buffered
Lakes in shallow soillow in limestonebecome acidic
Wet acid deposition(droplets of H2SO4 andHNO3 dissolved in rainand snow)
Dry acid deposition(sulfur dioxide gasand particles ofsulfate and nitrate salts)
Windborne ammonia gasand some soil particles partiallyneutralize acids and form drysulfate and nitrate salts
Sulfur dioxide(SO2) and NO
Nitric oxide (NO)
Acid fog
Transformation to sulfuric acid (H2SO4) and nitric acid (HNO3)
Wind
Acid Deposition
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Effects Of Pollution
• Respiratory diseases in humans
• Toxic metal leaching
• Structural damage
• Kills fish and other aquatic organisms• Leaches plant nutrients from soil
• Acid clouds and fog at mountaintops
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Acid Rain
SO2 & NOX
+water
SEASea LakeFactories, Transportation
Solar Radiation
H2SO4 (Sulphuric Acid)HNO3 (Nitric Acid)
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The Greenhouse Effect
Earth’s natural greenhouse effect
Natural greenhouse gasesWater vapor (H2O)Carbon dioxide (CO2)Methane (CH4)Nitrous Oxide (N2O)
Enhanced greenhouse effect Global warming
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Effect of Global warming• Rise in average global surface temperature• Changes in glaciers, rainfall patterns,
hurricanes• Droughts and floods. Threat to biodiversity• Decreased food production• Diseases (Threats to human health)• Economic and social disruption
• Rising sea levels• Extreme weather
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Government Roles in Reducing the Threat of Climate Change (1)
• Regulate carbon dioxide as a pollutant
• Carbon taxes
• Cap total CO2 emissions
• Subsidize energy-efficient technologies
• Technology transfers
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Photochemical reactions
Photochemical smogBrown-air smog
Sources
Climate effects
Urban areas
Photochemical Smog
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A
MethaneCarbon Dioxide Nitrous oxideOzone
EarthEarth
Carbon Dioxide
50%
Methane 18%
Chlorofluorocarbons
14%
Ozone 12%
Nitrous oxide
06%Green house gases in natural condition insulates the earth against extreme of temperature by limiting both incoming solar radiation & escape of reradiated heat in to space.
This natural balance may be distorted by Green House Effect as gases such as carbon dioxide have built up in the atmosphere trapping more heat
sun
Infra-red radiation
Atmosphere
Surface Temperature normal
Some reradiated heat reflected back to earth
Atmosphere
sun
Surface Temperature increases
More reradiated heat reflected back to earth
Less reradiated heat escapes in to space
Some reradiated heat escapes in to space
sun
Contribution of different gases to cause green house effect
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H2O WaterNO2
Nitrogen dioxide
Hydrocarbons
O2
Molecular Oxygen
HNO3 Nitric Acid
PANs Peroxyacyl nitrates
Aldyhydes (e.g. Formaldehyde)
O3 Ozone
O Atomic Oxygen
NO Nitric Oxide
Ultraviolet Radiation
Photochemical Smog
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Ozone Layer thinning• Affect on seasonal changes
• Causes – chlorofluorocarbons (CFCs) that uses in:
• Coolants in air conditioners and refrigerators
• Propellants in aerosol cans
• Cleaning solutions for electronic parts
• Fumigants
• Bubbles in plastic packing foam
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Ultraviolet rays from Sun
The Ozone layer in stratosphere blocks these harmful UV rays
Chlorofluorocarbons are entering in to atmosphere releasing chlorine. The chlorine than break down the ozone
The chlorine released from CFCs break down the ozone molecule.
chlorine
ozone
More ultraviolet radiations are reaching in to earths surface as there is a whole in ozone layer.
Oxygen
Whole in Ozone layer
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Reversing Ozone Depletion
• Stop producing ozone-depleting chemicals
• Slow recovery
• Montreal Protocol
• Copenhagen Protocol
• International cooperation
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Indoor air qualityIndoor air quality (IAQ) is a term referring to
the air quality within and around buildings and structures.
IAQ can be affected by microbial contaminants (mold, bacteria), gases (including carbon monoxide, radon, volatile organic compounds),and particulates
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Major Indoor Air Pollutants• Tobacco smoke
• Formaldehyde
• Radioactive radon-222 gas
• Very small particles
• Sick-building syndrome (SBS)
• Developing countries – Indoor cooking and heating
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Air Pollution and the Human Respiratory System
• Natural protective system
• Lung cancer, chronic bronchitis, emphysema, asthma
• Premature deaths
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Air Pollutants and its impact on human health
Particulate MatterDust and smoke particles cause irritation of the respiratory tract and produce bronchitis, asthma and lung diseases.Dust and smoke function as nuclei for condensation of water vapors and produce smog which attract chemicals like SO2, H2S, NO2,etc. Smog not only reduce visibility but is also harmful due to its contained chemicals.
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NOISE POLLUTIONThe term noise is applied to the sound that cause irritation on hearing of healthy human being.
Sources
Transport noise--- Originates from road traffic (vehicular), air craft and rail traffic. Industrial noise--- It produced by presses; punch and stamp machine, pneumatic drills, milling machines, cutter and routers, dust extractors. etc. Domestic noise--- It is generated from domestic appliance like washing machines, spin dryers, food mixer, sink waste grinder and vacuum cleaner.
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Effects Of Noise Pollution
Hearing damage from noise exposure
Pathological and Physiological disorders
The impact of noise may cause permanent
hearing loss due to the exposure to noise
levels exceeding 90 dB
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What is sick building syndrome ?
The feeling of illness among majority of occupants of a conditioned space is called “Sick Building Syndrome”.
A variety of illness symptoms reported by occupants in sick buildings are – Headache, fatigue, irritation in eyes, nose and throat, shortness of breathe etc.
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CausesInadequate ventilation insufficient supply of outside air; poor
mixing; fluctuations in temperature & humidity;
What is sick building syndrome ?
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AssignmentSide effects of pollution by ozone made by :• Mahmoud Rady Akila• Ahmed Abdeen• Sary Ibrahim• Ahmed Shafiq• Sayed GhzeSide effects of methan pollution made by:• Eman Mohamed Ahmed• Hager Abd el shafiq• Hanan Helmy Ibrahim
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Recommended text book• Basic Environmental Health