õhusilmaõhu

Õhusilmaõhu is a term used in Estonian-language discussions to refer to the air that fills Earth's atmosphere. While not a fixed technical term in international meteorology, it appears in educational materials to describe the properties and composition of atmospheric air and its role in weather, climate, and health.

Etymology and scope: The word combines elements meaning air and sky. In practice, its use varies: sometimes it denotes the atmospheric air as a physical medium, sometimes the concept of air quality or the entire atmospheric column from surface to upper layers.

In meteorology and environmental science, discussions of õhusilmaõhu encompass composition (major gases such as nitrogen and oxygen and trace constituents), physical state (temperature, pressure, humidity), and atmospheric processes (aerosol dynamics and radiation balance). Air quality is a key aspect, including contaminants such as particulates, ozone, nitrogen oxides, sulfur compounds, and volatile organic compounds.

Measurement and study: Observations come from weather stations, balloons, aircraft, ground-monitoring networks, and satellites. Instruments measure temperature, pressure, humidity, wind, and gas concentrations; remote sensing and in situ sampling provide data for weather prediction, climate models, and health-impact assessments.

See also: atmosphere, air quality, meteorology, atmospheric chemistry, climate science.