Haze is traditionally an atmospheric phenomenon where dust, smoke and other dry particles obscure the clarity of the sky. The WMO 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. [ [http://www.wmo.ch/pages/prog/www/WMOCodes/Manual/WMO306_vol-I-2-PartB.pdf WMO Manual on Codes] ] Sources for haze particles include farming (ploughing in dry weather), traffic, industry, forest fires and peat field fire.

Seen from afar (e.g. approaching airplane), haze appears brownish, while mist is bluish-grey. Whereas haze formation is a phenomenon of dry air, mist formation is a phenomenon of humid air. However, haze particles may act as condensation nuclei for later mist droplet formation.

Haze is also use to describe turbidity in clear glass or plastic as a percent value, or turbidity in beer or wine.

Air pollution

Haze often occurs when dust and smoke particles accumulate in relatively dry air. When weather conditions block the dispersal of smoke and other pollutants they concentrate and form a usually low-hanging shroud that impairs visibility and may become a respiratory health threat. Industrial pollution can result in dense haze, which is known as smog.

Since 1991, haze has been a particularly acute problem in Southeast Asia. In response the ASEAN countries agreed on a Regional Haze Action Plan (1997) and later signed the Agreement on Transboundary Haze Pollution (2002). Under the agreement the ASEAN secretariat hosts a co-ordination and support unit. [ [http://www.haze-online.or.id/ ASEAN action hazeonline] ]


Haze causes issues in the area of terrestrial photography, where the penetration of large amounts of dense atmosphere may be necessary to image distant subjects. This results in the visual effect of a loss of contrast in the subject, due to the effect of light scattering through the haze particles. Haze can be defined as an aerial form of the Tyndall effect therefore unlike other atmospheric effects such as cloud and fog, haze is spectrally selective: shorter (blue) wavelengths are scattered more, and longer (red/infrared) wavelengths are scattered less. For this reason many super-telephoto lenses often incorporate yellow filters or coatings to enhance image contrast.

Infrared (IR) imaging may also be used to penetrate haze over long distances, with a combination of IR-pass optical filters (such as the Wratten 89B) and IR-sensitive detector.


With production of plastic films haze has technical significance as the percentage of light that is deflected more than 2.5° from the incoming light direction. [ [http://www.thermallamination.com/haze.php Haze technical definition] ]

ee also

* Aerial perspective
* Arctic haze
* Saharan Air Layer
* Smog


External links

* [http://www.npi.gov.au/database/substance-info/profiles/69.html National Pollutant Inventory - Particulate matter fact sheet]

Wikimedia Foundation. 2010.


Look at other dictionaries:

  • Haze — bezeichnet: Haze (Optik), optischer Parameter zur Beschreibung des Streuverhalten eines Materials oder optischen Aufbaus Haze (Cannabis), Cannabissorte Haze (Computerspiel), Computerspiel Haze (Film), Film von Shinya Tsukamoto Haze ist der… …   Deutsch Wikipedia

  • Haze — Разработчик Free Radical Design Издатель Ubisoft …   Википедия

  • Haze (MC) — Haze Datos generales Nombre real Sergio López Sanz Origen Sevilla   …   Wikipedia Español

  • haze — n Haze, mist, fog, smog denote an atmospheric condition which deprives the air near the earth of its transparency. Haze applies to such a condition as is caused by the diffusion of smoke, dust, or a light vapor through the air in such a way as to …   New Dictionary of Synonyms

  • Haze — (h[=a]z), n. [Cf. Icel. h[ o]ss gray; akin to AS. hasu, heasu, gray; or Armor. a[ e]zen, [ e]zen, warm vapor, exhalation, zephyr.] 1. Light vapor or smoke in the air which more or less impedes vision, with little or no dampness; a lack of… …   The Collaborative International Dictionary of English

  • Haze — puede hacer referencia a: Haze, un videojuego. Jenna Haze, actriz porno. Haze, MC de Sevilla Esta página de desambiguación cataloga artículos relacionados con el mismo título. Si llegaste aquí a través de …   Wikipedia Español

  • Haze — Haze, v. i. To be hazy, or thick with haze. Ray. [1913 Webster] …   The Collaborative International Dictionary of English

  • HaZe — is a X window manager extensively based on the Takashi Hasegawa creation known as MLVWM, the Apple Macintosh interface mimicking window manager.Created in 2001, HaZe is a virtual window manager distributed under the GNU General Public License… …   Wikipedia

  • Haze — Haze, v. t. [imp. & p. p. {Hazed} (h[=a]zd); p. pr. & vb. n. {Hazing}.] [Also {hase}.] [Cf. Sw. haza to hamstring, fr. has hough, OD. h[ae]ssen ham.] 1. To harass by exacting unnecessary, disagreeable, or difficult work. [1913 Webster] 2. To… …   The Collaborative International Dictionary of English

  • Haze — [heiz] der; s [...siz] <aus engl. haze »Dunst(schleier)« zu hazy »neblig, dunstig«> Smog, der durch unkontrollierte Brände, Brandrodungen od. Naturkatastrophen entsteht …   Das große Fremdwörterbuch

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.