Air Quality1
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Transcript of Air Quality1
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Definitions Unit Measurement Source of Pollutants Classification of Pollutants
Particulates Hydrocarbons CO Oxides of Sulfur Oxides of Nitrogen Photochemical Oxidants Indoor Air Pollution
Global Implications of Air Pollution
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AIR POLLUTIONPresence in the outdoor atmosphere of one
or more air contaminant (i.e dust, fumes, gas, mist, odor, smoke or vapor) in sufficient quantities, of such characteristics and of such duration as to be or to threaten to be injuries to human, plant or animal life or to property or which reasonably interferes the comfortable enjoyment of life or property
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Suspended particulates- mass per unit volume basis (μg/m3)
Gaseous contaminants – ppm/ppb For gases, ppm convert to μg/m3
molLxmassgmolxppm
mg
/103
3
Standard condition for many chemical reaction:•T1 = 273 K (0°C)•P1 = 1 atm (760 mmHg)•V1 = 22.4 L/mol
While T2,P2,V2 relate to actual conditions being considered.
*But most air quality determinations are referenced at 25°C, 760 mmHg
2
22
1
11
TVP
TVP
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Natural sources Fungi spores, salt spray, smoke from
contaminant, dust particles from forest fires and volcanic eruptions
CO from the breakdown of methane Hydrocarbons from pine trees H2S and CH4 from the anaerobic
decomposition of organic matter
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Mobile transportation Stationary combustion Industrial processes Solid-waste disposal
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Mobile transportation
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Stationary combustionResidentialCommercialIndustrial power and heating including steam-powered electric power plant
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Industrial ProcessesChemicalMetallurgicalPulp-paper industriesPetroleum refineries
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Solid waste DisposalHouseholdCommercial refuseCoal refuseAgricultural burning
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Origin Considered as primary or secondary
contaminants Primary –found in the form of which
omitted (SOx, NOx and HC) Secondary –formed in atm by
photochemical reaction or hydrolysis or oxidation (ozone & peroxyacetyl nitrate (PAN) )
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Chemical composition Organic or inorganic Organic –contain C, H and other elements such
as O2, N2, Ph & S, carboxylic acids, alcohols, ethers, esters, amines etc
Inorganic –CO, CO2, carbonates, SO, NO, ozone, HF, HCl
State of matter Either particulate or gaseous Particulate –dust, fumes, smoke, fly ash Gaseous –behave much as air, CO, SO, NO, HC
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Oxides of sulphur
Carbon monoxideHydrocarbon
Particulate
Indoor Air Pollution
Oxides of nitrogen
Photochemical oxidants
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Identified as any dispersed matter, solid or liquid, in which the individual aggregates are <500μm but larger than small molecule
3 classification –physical, chemical or biological
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Size Particle of major interest in air pollution studies range
from 0.01 to 100 micron Ex: metallurgical fumes, cement dust, fly ash, carbon
black, sulfuric acid mist, smoke Mode of formation Dust-small, solid particles-created by the breakup of larger masses through processes
such as crushing, grinding or blast-may come directly from the processing or handling or
materials such as coal, cement or grains-by product of mechanical process –sawing of wood-residue of mechanical operation –sandblasting-do not diffuse –settle by gravity-diameter range-1.0 to 10000 micron
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Smoke-fine, solid particles-resulting from the incomplete combustion of organic
particles –coal, wood or tobacco-consist of mainly C & combustible materials-diameter range –0.5 to 1 micron
Fumes-Fine, solid particles-Formed by the condensation of vapors of solid
material-May come from sublimation, distillation, calcination or
molten metal processes-Diameter range –0.03 to 0.3 micron-Flocculate and coalesce –settle out
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Fly ash-Finely divided, noncombustible particles-Contained in flue gases from combustion of coal-Particles range 1.0 to 1000 micron –like dust-Results from burning –like smoke-Consist of inorganic metallic or mineral substances –like
fumes
Mist-Liquid particles or droplets-Formed by the condensation of a vapor, dispersion of liq or
enactment of chemical reaction-Less than 10 micron in diameter-High conc of mist -fog
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Spray -Liquid particles -Formed by the atomization of parent liquids, such as
pesticides and herbicides-Particle range 10 to 1000 micron in diameter
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Settling properties Is the major natural self-cleansing
process Suspended particulates –size less than
1 to 20 micron Settleable particulates –larger than 10
micron
18)( 2
pwpt
dgv
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Optical qualities Cause reduction in visibility Affected by particles in range of visible light
(0.38 to 0.76 micron) Affected by particle shape, surface
characteristics, distribution of particlesChemical characteristics Contain both organic and inorganic
components Organic –phenols, organic acids, alcohols Inorganic –nitrates, sulfates, metals (iron,
lead, manganese, zinc and vanadium)
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Biological characteristics Include protozoa, bacteria, viruses,
fungi, spores, pollens and algae Microorganisms survive for short time
in atm –lack of nutrients and ultraviolet radiation from sun
Certain bacteria and fungi –can survive for long periods
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Effect of particulates
On human health At high conc, poses hazards to those
susceptible to respiratory illness Human respiratory system defend itself
against invasion of foreign substances as indicated in Table 7-8 pg 437
The success or failure of respiratory defense system depends on size of particulates inhaled and depth of penetration
40% of 1 - 2 micron particles retain in bronchioles and alveoli
0.25 to 1 micron –breathed in and out Particles below 0.25 micron –results in
impingement
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Lead Human exposure originate from inhalation and
ingestion of lead containing particulates Affect reproductive, endocrine, hepatic etc Acute lead poisoning-vomiting, colic, insomnia,
irritability Chronic lead poisoning –headache, weakness
Aeroallergens -Refer to airborne substances causing allergies -Common allergens –pollen and spores -Others of biological origin –yeasts, molds, animal
fur, feathers and hair
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Effects on Plants and animals Little damage if deposited on a leaf surface Reduce photosynthesis, hence plant growth
Effects on Materials Soiling clothing and textiles Corroding metals (at RH above 75%) Eroding building surfaces Discoloring and destroying painted surfaces
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Organic compounds containing C and H only Aliphatic hydrocarbon:
Alkanes: saturated HC ( ex: methane), generally not active in atmospheric photochemical reaction
Alkenes/olefins : unsaturated, highly reactive in atmospheric photochemistry
Alkynes : highly reactive, rare, not major concern
Aromatic HC Biochemically and biologically active Some are potentially carcinogenic Concern ~ polynuclear group of aromatic HC because some of these
compounds have been shown to be carcinogenic ~ lung cancer Sources-Natural
Biological sourcesGeothermal areasCoal fieldsNG from petroleum fieldsNatural firesPlants & trees
-Anthropogenic Industrial sourcesTransportationSolid waste disposalForest firesetc
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Colourless, tasteless, odourless If high concentration ~ affect human,
vegetation & material Refer to table 7.11 page 445 Sources
Natural ~ vegetation decay ~ human metabolism ( a resting
person- 1 ppm CO) Anthropogenic ~ transportation
~ fuel combustion in stationary sources
~ industrial processes~solid waste disposal
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6 gaseous compounds Sulphur monoxide (SO) Sulphur dioxide (SO2) Sulphur trioxide (SO3) Sulphur tetraoxide (SO4) Sulphur sesquioxide (S2O3) Sulphur heptoxide (S2O7)
SO2 Colourless, nonflammable, nonexplosive, suffocating
odour, stable in athmosphere, highly soluble in water Source: Oil & gas industry, energy production, coal
burning, industrial combustion & industrial processes
Effect : Human: aggravates asthmatic & bronchitis Plants: damage vegetation
Transport~1000 km
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6 gaseous compounds Nitric oxide ( NO) Nitrogen dioxide ( NO2) Nitrous oxide ( N2O) Nitrogen sesquioxide ( N2O3) Nitrogen tetroxide ( N2O4) Nitrogen pentoxide ( N2O5)
NO2 Cause respiratory illness Source Transport, power generation &
industrial combustion Readily soluble in water~ nitrous acid or nitric
oxide
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Photochemical oxidants indicate the net oxidizing ability of ambient air
03, 0, 02, PAN, PPN, H2O2 eg f oxidants Effects of Oxidants
On human health – coughing, shortness of breath, airway constriction, heachace etc, exposure to high level of ozone result to damage chromosomes
Effects of plants – major oxidant cause damage to plant is O3 and PAN as both enter the plan leaf thru stomata and intefere plant cell metabolism, exposure level of 0.01 – 0.15 ppm will reduce crop yeilds (soybeans, corn, radishes)
Effects on materials – O3 oxidizes paint, elastomers, textile fibres and dyes Source of oxidants
Produced in upper atmosphere by solar radiation, lightning and forest fires
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Originated from building materials, furnishings, equipment and such human activities as cooking, cleaning and smoking
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Pollutants Source Detections Standard & Control
Hydrocarbon :Aliphatic HC (contain alkanes, alkenes and alkynes) and Aromatic HC
-Natural source are from biological sources –plant and tree-Anthropogenic –industrial refineries, transportation
Gas chromatography
S-160 μg/m3
C-incineration,adsorption, absorption, condensation
Carbon monoxide
Decaying vegetation-oxidation of methane-human metabolism-transportation,solid-waste disposal, forest fires
Nondispersiveinfrared (NDIR), gas chromatography, catalytic conversion, flame ionization detection
S-10 mg/m3 (8 hr)and 40 mg/m3 (1 hr)C-adsorption, abs, condensation, combustion
Oxides of sulfur –SO2 and SO3
Burning of solid and fossil fuel, industrial processes
Colorimetric, conductometric, coulometric, spectroscopic
S-6 to 10 μg/m3 for 24 hr averageC-burning fuel with less sulfur, dispersion by tall stacks, remove sulfur from fuel
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Pollutants Source Detections Standard & Control
Oxides of nitrogen –NO and NO2
-Natural source are solar radiation, lightning-Anthropogenic –fuel combustion, transportation
Calorimetric method, ultraviolet spectrophotometry, electrical tranducers
S-100 μg/m3
C-modification of combustion conditions, devices to remove NOX from exhaust
Photochemical oxidants –ozone, PAN, H2O2
Solar radiation, lightning
-,ultraviolet photometry-gas chromatography (PAN)
S-240 μg/m3 (1hr)and 40 mg/m3 (1 hr)
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-Results – gaseous emissions of sulfur oxides (SOx) and nitrogen oxides
(NOX) + water vapour + sunlight strong acidic compounds
(i.e H2SO4 & HNO3)
- H2SO4 & HNO3 + other organic & inorganic chemicals are deposited on the earth as: i) Dry deposition : aerosol & particulates
ii)Wet deposition: raindrops, snowflakes , fog or dew-Effect of acid rain deposit vary i) sensitivity of ecosystem ii) damage to building & monuments in highly industrialized areas
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O3 reduces UV radiation that reaches earth’s surface O3 layer deplete from O3 reaction with Cl2 - CFC (use as
aerosol spray propellants) Industrialized nation – banned the use of fluoroC
CO2 increase – O2 decreases Increase in CO2 :
Fossil fuel consumption Agricultural Forestry Land use practices
Continued build up – melt Artic ice pack
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Cold countries ~a green house usually built a glass~ used to grow plants & flowers that require plenty of warmth
Sunshine thru glass ~ inside of the greenhouse( very warm)~ roof and walls keep heat from escaping
Earth’s T increase even 1°C experience change in : Weather patterns Flooding Rising sea-level Glaciers melt
But industrial gases i.e CO2, CH4, Nox, CFC ~ trap a certain kind of radiation ( infrared) ~ heat ~ keep it close to earth’s surface
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Malaysian Air Pollution Index (MAPI) ~ measures level of criteria air pollution May occur as a result of :
Natural causes Man’s activities
• Natural pollutants: Soil dust Volcanic eruption Salt splashes from the sea
• Man made pollutants: Smoke & wastes from fuel burning Wastes from industrial processes HC from combustion processes
Normal local & foreign sources: Motor vehicles Industrial operation Open burning Land clearing & construction Deforestation Ashes from volcanic eruption