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  2. Ozone - Wikipedia

    en.wikipedia.org/wiki/Ozone

    These ozone generators can produce over 3 g of ozone per hour. Ozone often forms in nature under conditions where O 2 will not react. [29] Ozone used in industry is measured in μmol/mol (ppm, parts per million), nmol/mol (ppb, parts per billion), μg/m 3, mg/h (milligrams per hour) or weight percent. The regime of applied concentrations ranges ...

  3. Dragostea din tei - Wikipedia

    en.wikipedia.org/wiki/Dragostea_din_tei

    [277] [280] A remix EP was made available for digital download on 3 August 2004 in various countries. [281] In 2005, a CD was released in Taiwan by Avex Trax under ...

  4. International Day for the Preservation of the Ozone Layer

    en.wikipedia.org/wiki/International_Day_for_the...

    The United Nations designates a specific theme each year for the International Day for the Preservation of the Ozone Layer to highlight different facets of ozone protection. 2015: 30 Years of Healing the Ozone Together. [6] 2016: Ozone and climate: Restored by a world united. [7] 2017: Caring for all life under the sun. [8] 2018: Keep Cool and ...

  5. Ozone depletion - Wikipedia

    en.wikipedia.org/wiki/Ozone_depletion

    Following the ozone depletion in 1997 and 2011, a 90% drop in ozone was measured by weather balloons over the Arctic in March 2020, as they normally recorded 3.5 parts per million of ozone, compared to only around 0.3 parts per million lastly, due to the coldest temperatures ever recorded since 1979, and a strong polar vortex which allowed ...

  6. O-Zone - Wikipedia

    en.wikipedia.org/wiki/O-Zone

    artists.universal-music.de /ozone O-Zone is a Moldovan Eurodance group and boy band produced by Dan Bălan ; originating in 1999 [ 1 ] [ 2 ] as a duo, which consisted of Bălan, and Petru Jelihovschi before the latter's departure.

  7. Ozone layer - Wikipedia

    en.wikipedia.org/wiki/Ozone_layer

    The ozone layer visible from space at Earth's horizon as a blue band of afterglow within the bottom of the large bright blue band that is the stratosphere, with a silhouette of a cumulonimbus in the orange afterglow of the troposphere. The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet ...

  8. Ground-level ozone - Wikipedia

    en.wikipedia.org/wiki/Ground-level_ozone

    Ground-level ozone (O 3), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth's atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.

  9. Air quality guideline - Wikipedia

    en.wikipedia.org/wiki/Air_quality_guideline

    For ozone (O 3), the guidelines suggest values no higher than 100 μg/m 3 for an 8-hour mean and 60 μg/m 3 peak season mean. [2] For nitrogen dioxide (NO 2), the guidelines set 10 μg/m 3 for the annual mean or 25 μg/m 3 for a 24-hours mean. [2] For sulfur dioxide (SO 2), the guidelines stipulate concentrations not exceeding 40 μg/m 3 24 ...