Altitudes

In high altitudes, people find it hard to breathe.

Contrails are long, narrow, ice-crystal clouds that form behind jet planes flying at high altitudes in below-freezing temperatures. They result from the condensation of water vapor remaining in jet exhaust.

Unlike its presence at high altitude where ozone acts as Earth's sunscreen from harmful ultraviolet radiation, at low altitudes, ozone is a health hazard contributing to respiratory problems like asthma and bronchitis.

Boil water at least one minute before drinking it. At high altitudes, you should boil it longer.

The barometer is an instrument that measures atmospheric pressure, especially used to study climate and to determine altitudes.

Snowfall is expected at high altitudes tomorrow.

The mountain ecosystem is characterized by high altitudes and extreme weather conditions.

Arabica coffee, the higher-quality variety that Kenya grows, ends up in specialty coffees in Europe and the United States. It thrives in moderate temperatures and high altitudes. But rising temperatures are scorching plants, making them vulnerable to diseases like coffee leaf rust.

Stratospheric winds may also influence commercial air traffic. Many airplanes fly at high altitudes to reduce fuel consumption.

Most bumblebees live at higher altitudes.