CNG prices in Delhi-NCR and Mumbai have seen steep hikes today. In Delhi, the CNG prices have gone up by another Rs 2.5 per kg and in Mumbai, it has gone up by Rs 7 per kg. The soaring prices have led to hassled passengers, cabs and auto drivers.The increase in CNG prices follows Rs 10 per litre hike in petrol and diesel prices in 16 days and a Rs 50 per cylinder raise in the cooking gas LPG rates.