Why are specialized infrared telescopes located in arid highlands?

Water vapor in the Earth’s surface atmosphere strongly absorbs light in the infrared wavelength range. Installing the telescope in arid and high-altitude climates allows the telescope to be raised above the main absorbing layer. At the same time, the content of other absorbing molecules in this range (for example, carbon dioxide) also decreases. In addition, it is colder on average in high-mountainous regions, which reduces the overall heat background.

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