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Six air pollutants
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*carbon monoxide *nitrogen dioxide *ozone (when not contained in ozone layer) *sulfur dioxide *PM *lead
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PM10
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*dust, soot, dirt, bacteria, viruses *diameter of 10 micrometers of less
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PM2.5
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*fine particles *diameter of less than 2.5 micrometers
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Micrometer
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*um *AKA micron *10^-6 of a meter
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Mixture
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Physical combination of 2+ substances
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Air composition reference tables list no humidity...
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Because % varies according to climate & daily forecast
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Air contains:
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*oxygen *nitrogen *argon *carbon dioxide *water
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Normal composition of dry air
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*78% nitrogen *21% oxygen *1% other gases
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Percent AKA
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Parts per hundred (pph)
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Volume of a gas...
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*increase w/ temperature *decreases w/ pressure *so compare all gases @ same temp & pressure
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Ppm
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*parts per million * 1/1,000,000 is 10,000x less than 1%
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Odors
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*travel thru air in trace quantities *olfactory receptors (nose) is extremely sensitive
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Carbon monoxide (pollutant)
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*"silent killer" *causes dizziness, headache, nausea & sometimes death *Ex: generator, charcoal grill, auto exhaust
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Ozone (pollutant)
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*chest pain, coughing, sneezing *pulmonary congestion *Ex: photocopiers, electric motors
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Sulfur & nitrogen oxides (pollutant)
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*affects elderly, children, people w/ emphysema or asthma *contributes to acid rain & London fog of 1952
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