CNG price in the national capital was hiked by Rs 2 per kg on Tuesday, the fourth increase in less than two weeks.CNG will now cost Rs 83.09 per kg, according to Indraprastha Gas Ltd. This is the fourth such increase since May 15, taking the cumulative hike to Rs 4 per kg.The CNG hike also impacts public transport fleets in cities like Delhi and Mumbai, where a large share of buses and cabs run on the fuel.Petrol and diesel prices were also hiked once again on Monday, marking the fourth increase in less than two weeks amid continued volatility in global crude markets and ongoing geopolitical tensions in West Asia.Following the latest revision, petrol prices in Delhi crossed the Rs 100-mark, rising by Rs 2.61 to Rs 102.12 per litre, while diesel prices increased by Rs 2.71 to Rs 95.20 per litre.Similar hikes were witnessed across major metropolitan cities, including Kolkata, Mumbai and Chennai, adding to the burden on consumers and transport operators.