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  2. Air pollution in Malaysia - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_in_Malaysia

    Air pollution has been an ongoing problem in many countries in the Southeast Asia region, and Malaysia is one of the worst affected. Haze has been a major issue for the country, driven by slash and burn practices by farmers and peat fires blown by the wind from Indonesia.

  3. Air pollution - Wikipedia

    en.wikipedia.org/wiki/Air_pollution

    Air pollution is the presence of substances in the atmosphere that are harmful to humans and other living beings, or cause damage to the environment. Air pollution can be chemical, physical or biological. [1]

  4. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel.

  5. 2015 Southeast Asian haze - Wikipedia

    en.wikipedia.org/wiki/2015_Southeast_Asian_haze

    The 2015 Southeast Asian haze was an air pollution crisis affecting several countries in Southeast Asia, including Brunei, Indonesia (especially its islands of Sumatra and Borneo), Malaysia, Singapore, southern Thailand, Vietnam, Cambodia and the Philippines.

  6. Plastic pollution - Wikipedia

    en.wikipedia.org/wiki/Plastic_pollution

    Plastic pollution is the accumulation of plastic objects and particles (e.g. plastic bottles, bags and microbeads) in the Earth's environment that adversely affects humans, wildlife and their habitat.

  7. Air pollution in Mexico City - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_in_Mexico_City

    Air pollution is defined as the presence of substances in the atmosphere that can be harmful to life when they are found in high quantities. In Mexico City's atmosphere, the pollutants are found as primary and secondary pollutants.

  8. Pengangkutan Penumpang Djakarta - Wikipedia

    en.wikipedia.org/wiki/Pengangkutan_Penumpang...

    Perusahaan Umum Pengangkutan Penumpang Djakarta (lit. Djakarta Passenger Transport Public Corporation ) simplified as Perum PPD or PPD , was an Indonesian statutory corporation operating land transportation in Jakarta and the surrounding areas.

  9. Visual pollution - Wikipedia

    en.wikipedia.org/wiki/Visual_pollution

    Visual pollution is the degradation of the visual environment due to unattractive or disruptive elements that negatively impact the aesthetic quality of an area. It can affect urban, suburban, and natural landscapes. [1]