The composition of air has changed over Earth's history due to volcanic activity, biological evolution (notably photosynthesis increasing oxygen), and more recently, human activities causing climate change and pollution.

In summary, air is a vital, dynamic mixture of gases and particles essential for life, climate regulation, and environmental processes on Earth.

Air also contains suspended particles known as aerosols, including dust, pollen, sea spray, and human-made pollutants, which affect air quality and weather phenomena.

The atmosphere acts as a protective shield by:

Blocking harmful ultraviolet radiation from the Sun via the ozone layer

Moderating Earth's temperature through the greenhouse effect

Redistributing heat and moisture globally through air currents.

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Air also contains suspended particles known as aerosols, including dust, pollen, sea spray, and human-made pollutants, which affect air quality and weather phenomena.

The atmosphere acts as a protective shield by:

Blocking harmful ultraviolet radiation from the Sun via the ozone layer

Moderating Earth's temperature through the greenhouse effect

Protecting the surface from meteoroids

Redistributing heat and moisture globally through air currents.