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Particulate size PM 2.5 is responsible f...

Particulate size PM 2.5 is responsible for causing greatest harm to human health. What is it? How is it harmful ?

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### Step-by-Step Solution: 1. **Definition of PM 2.5**: - PM 2.5 refers to particulate matter that is 2.5 micrometers or smaller in diameter. This size is significant because it is small enough to be inhaled deeply into the lungs. 2. **Composition of PM 2.5**: - PM 2.5 can consist of a mixture of solid particles and liquid droplets that are present in the air. These particles can originate from various sources, including vehicle emissions, industrial discharges, and natural sources like wildfires. ...
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Knowledge Check

  • According to the central pollution control Board PM 2.5 are responsible for causing the greatest harm to human health. PM 2.5 stands for

    A
    Particulate matter which are 2.5 micrometers or less in diameter
    B
    Particulate matter which are 2.5 micrometers or more in diameter
    C
    Particulate matter which are 2.5 nanometers or less in diameter
    D
    Particulate matter which are 2.5 nanometers or more in diameter

  • Read the following statements regarding particulate matter and select the incoorect ones. (i) Particulate matter (PM) consists of shoot, flyash, dust, spores, pollen grains, etc. (ii) Particulate matter is differentiated into settleable (larger than 10 mu m , remaining in air for less than one day) and suspended (less than 10 mu m remaining in air for more than one day to several weeks ) particulate matter. (iii) SPM (Suspended particulate matter ) consists of aerosol, dust and mist. (iv) Particulate matter causes respiratory diseases such as tuberculosis, allergy and many more diseases in animals and plants. (v) According to Central Pollution Control Board (CPCB), particulate size of 2.5 mu m or less in diameter are responsible for causing the greatest harm to human health.

    A
    (i) and (ii)
    B
    (iii) and (iv)
    C
    (ii) only
    D
    None of these

  • According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter

    A
    2.50 micrometers
    B
    5.00 micrometers
    C
    10.00 micrometers
    D
    7.5 micrometers.

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