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True or False: PM2.5 refers to particulate matter with diameter less than 2.5 micrometers.
- True
- False
Answer: True
PM2.5 particles are fine inhalable particles (≤2.5 μm) that penetrate deep into lungs, causing respiratory/cardiovascular issues. Monitored under National Air Quality Index. [[CPCB Reports, NCERT Geography Class 11]]