Q. With reference to PM 2.5 (Fine particulate matter), consider the following statements:
1.These are most harmful to human health due to its prevalence in the environment and a broad range of health effects.
2.PM2.5 particles are generated through chemical process only.
3.PM2.5 particles vary in chemical composition and physical characteristics.
Which of the statements given above is/are correct?
Answer: C
Notes:
Statement 1 is correct: PM2.5 particles are most harmful to human health due to its prevalence in the environment and a broad range of health effects.
Statement 2 is incorrect: The most common human-made sources include internal combustion engines, power generation, industrial processes, agricultural processes, construction, and residential wood and coal burning. The most common natural sources for PM2.5 are dust storms, sandstorms, and wildfires.
Statement 3 is correct: PM2.5 is generated from many sources and can vary in chemical composition and physical characteristics. Common chemical constituents of PM2.5 include sulfates, nitrates, black carbon, and ammonium.
Source: Indian Express
