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According to the central pollution contr...

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

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding what PM 2.5 stands for, let's break it down step by step: ### Step 1: Understand the Term PM 2.5 - PM stands for "Particulate Matter," which refers to tiny particles or droplets in the air that can be inhaled. ### Step 2: Analyze the Options Given - The options provided are: 1. Particulate matter which are 2.5 micrometer or less in diameter 2. Particulate matter which are 2.5 micrometers or more in diameter 3. Particulate matter which are 2.5 nm or less in diameter 4. Particulate matter which are 2.5 nm or more in diameter ### Step 3: Identify the Correct Definition - PM 2.5 specifically refers to particulate matter that is 2.5 micrometers (µm) or less in diameter. This is crucial because particles of this size can penetrate deep into the lungs and even enter the bloodstream, causing significant health issues. ### Step 4: Eliminate Incorrect Options - Option 2 (2.5 micrometers or more) is incorrect because PM 2.5 refers to smaller particles. - Options 3 and 4 (2.5 nm) are also incorrect because they refer to a much smaller size than PM 2.5. ### Step 5: Confirm the Correct Answer - The correct answer is option 1: "Particulate matter which are 2.5 micrometer or less in diameter." ### Final Answer - PM 2.5 stands for "particulate matter which are 2.5 micrometers or less in diameter." ---
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