geography

Arctic Region and Arctic Council

The Arctic is a polar region located at the northernmost part of Earth.

8 Jul, 2020

BRAHMAPUTRA AND ITS TRIBUTARIES

About Brahmaputra River: The Brahmaputra called Yarlung

3 Jul, 2020
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    Current Affairs – 19th January 2022

    1.    SMOG

    • News: A walk of up to one km in three different directions from the smog tower in Connaught Place with a handheld air quality monitoring device has revealed fluctuating levels of the chief pollutant, PM 2.5.
    • About Smog:
      • 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 cities today.
      • Today, most of the smog we see is photochemical smog. Photochemical smog is produced when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere.
      • Nitrogen oxides come from car exhaust, coal power plants, and factory emissions.
      • VOCs are released from gasoline, paints, and many cleaning solvents. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.
      • Ozone can be helpful or harmful. The ozone layer high up in the atmosphere protects us from the sun’s dangerous ultraviolet radiation. But when ozone is close to the ground, it is bad for human health.
      • Ozone can damage lung tissue, and it is especially dangerous to people with respiratory illnesses like asthma. Ozone can also cause itchy, burning eyes.
      • Smog is unhealthy to humans and animals, and it can kill plants. Smog is also ugly. It makes the sky brown or gray. Smog is common in big cities with a lot of industry and traffic.
      • Cities located in basins surrounded by mountains may have smog problems because the smog is trapped in the valley and cannot be carried away by wind.

    2.    SWARM DRONES

    • News: A novel ‘Drone Show’ has been conceptualised, designed, produced and choreographed within the country. This ‘Make in India’ initiative has been organised by a startup ‘Botlab Dynamics’, supported by the Indian Institute of Technology (IIT) Delhi and Department of Science & Technology,” the official said.
    • About Swarm Drones:
      • Drone lightshows have a central computer on the ground tracking every single drone and moving them all in unison. The drones’ movements are dictated in a complicated and detailed version of air traffic control which is calculated so that the flightpaths stay separate and no collisions occur. The individual drones take no part in the decision-making process.
      • True swarm behavior arises from a simple set of rules which each of the participating members follows, with no central controller.
      • Natural swarming displays take place at higher speed with far greater coordination than drone lightshows. In a murmuration, tens of thousands of starlings carry out complex aerobatics, working together as naturally as part of the same organism.

    3.    UNITED ARAB EMIRATES

    • News: Terming the drone attacks by Houthi rebels in Abu Dhabi that left two Indians dead and two others injured, as “unacceptable”, India on Tuesday expressed solidarity with the United Arab Emirates (UAE).
    • Map: