Just ask those environmental experts who oppose metro --
1. how many taxis ply from/ to airport in a day?
2. What is the quantity of petrol sold in a day for 2 wheelers and cars?
3. How much poisonous gases are released due to traffic congestion per day?
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What are the pollution levels in existing metro routes 2 years back and current ? Especially in and around KR Puram Whitefield Marathahalli area?
Just check how many cabs and taxis are owned by those opposing metro.