Athens chokes in clouds of Sahara dust
Athenians are choking in clouds of thick dust blown in from the Sahara along with unseasonably warm weather, weather forecasters and doctors warned on Thursday.
Athenians are choking in clouds of thick dust blown in from the Sahara along with unseasonably warm weather, weather forecasters and doctors warned on Thursday.
Environment
Mar 28, 2024
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Scientists have simulated conditions that allow hazy skies to form in water-rich exoplanets, a crucial step in determining how haziness muddles observations by ground and space telescopes.
Astronomy
Nov 27, 2023
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The North China Plain (NCP) is a region with some of the worst air pollution conditions on a global scale. Air pollution (known as haze) dominated by higher PM2.5 concentration, is well-documented for its adverse impacts ...
Earth Sciences
Nov 21, 2023
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An Indonesian city with a population of hundreds of thousands has shut schools for three days because of haze caused by large peatland fires, its mayor said Tuesday.
Environment
Oct 3, 2023
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The results of the experiment "Comprehensive Observation on the Atmospheric boundary layer Three-dimensional Structure" (COATS) were recently published online in Science China Earth Sciences. This study enriches the understanding ...
Earth Sciences
Jun 26, 2023
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A haze frequently hangs over China, particularly over the highly populated North China Plain in the autumn and winter months. The concentration of haze pollution particulates (PM2.5) in this region has reached over twice ...
Earth Sciences
Sep 29, 2022
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The North China Plain (NCP), one of the world's most polluted regions, is frequently engulfed by severe haze in the cold season, which has aroused broad public concern because of the adverse impacts on air quality, atmospheric ...
Earth Sciences
Sep 7, 2022
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84
Observations from Hubble Space Telescope, the NASA Infrared Telescope and the Gemini Observatory, reveal that excess haze on Uranus makes it paler than Neptune and that dark spots are caused by a darkening of a second deeper ...
Astronomy
May 31, 2022
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Haze is formed when a cocktail of various gaseous pollutants is oxidized and forms particulate matter diffusing sunlight. This process is mainly mediated by hydroxyl radicals (OH), and researchers have now discovered a new ...
Materials Science
Mar 31, 2022
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127
Many exoplanets have opaque atmospheres, obscured by clouds or hazes that make it hard for astronomers to characterize their chemical compositions. A new study shows that haze particles produced under different conditions ...
Astronomy
Jul 12, 2021
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Haze is traditionally an atmospheric phenomenon where dust, smoke and other dry particles obscure the clarity of the sky. The World Meteorological Organization manual of codes includes a classification of horizontal obscuration into categories of fog, ice fog, steam fog, mist, haze, smoke, volcanic ash, dust, sand and snow. Sources for haze particles include farming (ploughing in dry weather), traffic, industry, and wildfires.
Seen from afar (e.g. approaching airplane) and depending upon the direction of view with respect to the sun, haze may appear brownish or bluish, while mist tends to be bluish-grey. Whereas haze often is thought of as a phenomenon of dry air, mist formation is a phenomenon of humid air. However, haze particles may act as condensation nuclei for the subsequent formation of mist droplets; such forms of haze are known as "wet haze."
In the United States and elsewhere, the term "haze" in meteorological literature generally is used to denote visibility-reducing aerosols of the wet type. 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. The reactions are enhanced in the presence of sunlight, high relative humidity, and stagnant air flow. A small component of wet haze aerosols appear to be derived from compounds released by trees, such as terpenes. For all these reasons, wet haze tends to be primarily a warm-season phenomenon. Large areas of haze covering many thousands of kilometers may be produced under favorable conditions each summer.
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