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Archive for the ‘Pollution’ Category

Air quality is determined as a measure of the condition of the air, compared with one or more types of biotic and / or human needs or purposes. [1] Air quality index (AQI) numbers used by government agencies to characterize the quality of the air of a place. By increasing the AQI, that is a growing proportion of the population will likely experience more serious health effects. To calculate the AQI needs  the concentration of air pollutants from the screen or model. The function used to convert the concentration of air pollutants AQI vary depending on the contaminants, and vary in different countries. Air Index value as divided into ranges and each range was assigned a color code descriptor. Standardized public health warnings associated with each interval AQI. It may also encourage community members to take public transportation to work from home when AQI levels are high.

Earth’s atmosphere is a layer of gases surrounding the Earth, which is maintained by means of gravity on Earth. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, heating the surface by heat (greenhouse effect) and reducing temperature extremes between day and night (daily temperature variations).

Atmospheric stratification describes the structure of the atmosphere, it splits into separate layers, each with special characteristics such as temperature or composition. The atmosphere gets thinner and thinner with increasing altitude, can not determine the boundary between the atmosphere and space. At an altitude of 120 km (75 miles) is where atmospheric effects become noticeable during atmospheric re-entry of spacecraft. Karman line, 100 km (62 miles) are often regarded as the boundary between the atmosphere and space.

Air is the name given to the atmosphere used in respiration and photosynthesis. Dry air contains approximately 78.09% nitrogen, 20.95% oxygen 0.93% argon, 0.039% carbon dioxide and small amounts of other gases (by volume). Air also contains varying amounts of water vapor, an average of 1%. While the content of the air pressure varies in different layers, air, suitable for survival of terrestrial plants and land animals now known to be only found in Earth’s troposphere and artificial atmospheres.