Ozone (O₃) at ground level is:
Answer & Solution
Correct answer: D.
1. Ozone is a strong oxidiser.
2. Near the ground, it irritates lungs and damages plants.
3. Only stratospheric ozone is protective; tropospheric ozone is a pollutant.
_Source: NCERT Class 10 Science, Ch 13 "Our Environment", §13.2.1_
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