Environmental Science
Particulate pollutants are

are small solid particles and liquid droplets
all of these
are small solid particles released into the atmosphere
liquid droplets in atmosphere

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

50% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere

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