The Air Quality Index ranks air quality by its effects on human health.
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Q7: Particulate matter is an aerosol.
Q8: In the stratosphere air flows mostly horizontally.
Q9: The higher the molecular density of air,
Q10: On average, the Dead Sea has the
Q11: Aurora australis occurs in the Northern Hemisphere.
Q13: The environmental lapse rate in the troposphere
Q14: The tropopause is higher above Earth's surface
Q15: Nitrogen molecules in the atmosphere are a
Q16: Northern lights occur in the mesosphere.
Q17: CFCs (chlorofluorocarbons) are gases that occur naturally
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