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- In meteorological literature, the word haze is generally used to denote visibility-reducing aerosols of the wet type suspended in the atmosphere. Such aerosols commonly arise from complex chemical reactions that occur as sulfur dioxide gases emitted during combustion are converted into small droplets of sulfuric acid when exposed.
en.wikipedia.org/wiki/Haze
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What is haze & why is it a problem?
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What are haze causing particles?
haze, suspension in the atmosphere of dry particles of dust, salt, aerosols, or photochemical smog that are so small (with diameters of about 0.1 micron [0.00001 cm]) that they cannot be felt or seen individually with the naked eye, but the aggregate reduces horizontal visibility and gives the atmosphere an opalescent appearance.
- The Editors of Encyclopaedia Britannica
Mar 31, 2022 · Haze consists of fine particulate matter containing soot. It is formed when gaseous pollutants, which are from industrial emissions, vehicle exhausts, and other sources, are converted to condensable matter. “This condensation is remarkably accelerated under the action of OH radicals,” says Joseph S. Francisco.
Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction.
Haze can be defined as an aerial form of the Tyndall effect therefore unlike other atmospheric effects such as cloud, mist and fog, haze is spectrally selective in accordance to the electromagnetic spectrum: shorter (blue) wavelengths are scattered more, and longer (red/infrared) wavelengths are scattered less.
Haze in plastics can be defined as the percentage of incident light scattered by more than 2.5° through the plastic specimen. It measures the milkiness of the material (film or sheet). It is expressed in percentage (%).
Sep 14, 2023 · To summarize, haze meters measure haze by capturing the light scattered away from the direct optical path using an integrating sphere and a ring detector. The relative transmission of this scattered light, compared to the total transmission, determines the level of haziness in the sample material.
Haze is caused when sunlight encounters tiny pollution particles in the air. Some light is absorbed by particles. Other light is scattered away before it reaches an observer. More pollutants mean more absorption and scattering of light, which reduce the clarity and color of what we see.
