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smog    音标拼音: [sm'ɑg]

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  • Smog - Wikipedia
    Smog, or smoke fog, is a type of intense air pollution The word "smog" was coined in the early 20th century, and is a portmanteau of the words smoke and fog [1] to refer to smoky fog due to its opacity, and odour [2]
  • Smog | Description, Causes, Effects, Types | Britannica
    Smog, community-wide polluted air Although the term is derived from the words smoke and fog, it is often used to describe the pall of automotive or industrial origin that lies over many cities, and its composition is variable At least two distinct types of smog are recognized: sulfurous smog and photochemical smog
  • Smog - National Geographic Society
    Smog is air pollution that reduces visibility The term "smog" was first used in the early 1900s to describe a mix of smoke and fog The smoke usually came from burning coal Smog was common in industrial areas, and remains a familiar sight in some cities today Today, most of the smog we see is photochemical smog
  • What Is Smog, and What Have We Done to Improve Air Quality?
    Simply put, smog is the generic term for certain types of air pollution, particularly very visible, thick air pollution associated with large cities and industrial zones
  • What Causes Smog? | How Smog Is Formed - Caltech Science Exchange
    Smog is mainly made of ground-level ozone and particulate matter Here, Caltech scientists explain the smog formation process
  • Learn About the Causes and Effects of Smog - Treehugger
    Smog is a mixture of air pollutants— nitrogen oxides and volatile organic compounds —that combine with sunlight to form ozone Ozone can be beneficial or harmful depending on its location
  • Smog, Soot, and Other Air Pollution from Transportation
    EPA implements national programs and standards for fuels and vehicles that reduce air pollution including smog, soot, and toxic pollutants, and spur investments in clean vehicle and engine technology
  • Smog Check: When you need one and whats required
    To determine when a vehicle will need its first Smog Check, add eight to the model year For example, a 2020 model-year vehicle will need a Smog Check for registration renewal in 2028 (2020 + 8 = 2028) Four model years and newer - do not need a Smog Check for a change of ownership Instead, California law requires a smog transfer fee
  • Smog Meaning, Causes, and Effects: Comprehensive Definition - Airly
    What is smog? Learn its definition, causes, and harmful effects on health and the environment Discover how smog impacts cities and ecosystems
  • What is Smog?: Causes, Effects, and Solutions – Decoding Biosphere
    Smog is a term derived from combining “smoke” and “fog,” signifying the visible haze that forms when smoke or other pollutants combine with fog or water vapor This phenomenon creates a thick, grayish-white layer of air pollution that reduces visibility and poses a range of health risks





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