Read before you practise · 2 min
Read the Harmful Particles and Catalysts
Fine particles reach deep into the respiratory tract, while catalytic converters reduce certain vehicle pollutants.
NSEB · Biodiversity and Conservation & Environmental Issues · 2 linked questions · 100% coverage
Know this first
Air Pollution and Particulates is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Biology · Biodiversity and Conservation & Environmental Issues
Size matters
Particles 2.5 micrometres or smaller can penetrate deeply into the lungs and are especially harmful. Catalytic converters use platinum, palladium and rhodium; lead is not a catalyst and can damage converter performance.
OlympIQ exam lens
- ✓PM₂.5: diameter ≤2.5 μm.
- ✓Catalytic metals: Pt, Pd and Rh.
- ✓Lead is not used as the converter catalyst.
OlympIQ trap
Keep units straight: PM₂.5 is measured in micrometres, not millimetres.
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