In 1990's Delhi ranked fourth among the most polluted cities of the world. What are the parallel steps taken to reduce vehicular pollution ?

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> [!TLDR]
> To cut vehicular pollution, Delhi's public transport was switched to CNG, along with unleaded petrol, catalytic converters, phasing out of old vehicles and stricter emission norms.
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> In the 1990s, Delhi was among the most polluted cities in the world, with vehicular emissions being a major contributor. A series of parallel steps were taken to bring this vehicular pollution under control:
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> 1. **Switch to CNG (Compressed Natural Gas):** Following a Supreme Court directive, all public transport vehicles in Delhi — buses, taxis and auto-rickshaws — were converted from diesel/petrol to the cleaner-burning fuel CNG.
> 2. **Phasing out of old vehicles:** Old, highly polluting vehicles were progressively removed from use.
> 3. **Use of unleaded (lead-free) petrol:** This reduced the release of toxic lead compounds into the air.
> 4. **Catalytic converters:** Vehicles were required to be fitted with catalytic converters, which convert harmful exhaust gases (CO, unburnt hydrocarbons, NOx) into relatively harmless ones. …

Q.In 1990's Delhi ranked fourth among the most polluted cities of the world. What are the parallel steps taken to reduce vehicular pollution ?

Concept understanding — Air Pollution and Control

Q.In 1990's Delhi ranked fourth among the most polluted cities of the world. What are the parallel steps taken to reduce vehicular pollution ?

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