18 Questions
What defines air pollution?
The introduction of substances or energy into the Earth's atmosphere causing harm to human health and the environment
What are primary pollutants?
Pollutants found in the atmosphere in the same form as emitted from the source
Which of the following is an example of a secondary pollutant?
Ozone created by reactions in the atmosphere
What causes photochemical smog?
Oxidation, hydrolysis, and photochemistry reactions in the atmosphere
How are air pollutants classified based on their origin?
By the position of sources (stationary or mobile)
What must occur simultaneously for an air pollution incident according to the text?
Sources, transport, and meteorological conditions
What is the primary gas that makes up the majority of normal air?
Nitrogen
What is the role of Earth's gravity in relation to the atmosphere?
It holds the atmosphere in place
What is the chemical symbol for helium in the normal composition of air?
He
How is the average molar mass of dry air calculated?
(0.781 × 28.01) + (0.209 × 32.00)
What characterizes the pressure of a gas in the atmosphere?
Due to collisions with other gas molecules
Which gas constitutes less than 1% of normal air but plays a role in greenhouse gas effect?
$CH_4$
Why does pressure decrease with height in the atmosphere?
Because the atmospheric pressure and density decrease exponentially with height.
What causes the stable poorly-mixed conditions characteristic of the stratosphere?
Decreasing air density above the troposphere.
What is responsible for the temperature increase up to the stratopause at 50 km in the atmosphere?
Warming due to solar energy absorption by the ozone layer.
What happens above the mesopause at 90 km in the atmosphere?
Energy partition between vibrational and translational modes occurs.
What causes a non-linear decrease of equilibrium radiative temperature with height in the atmosphere?
Longwave thermal radiation emitted by the Earth's surface.
Which process defines the well-mixed region known as the troposphere?
Overturning promoted by convective forces.
Learn about air pollution and its harmful effects on human health, living resources, and ecological systems. Explore the classification of air pollutants caused by both man's activities and natural sources.
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