The price of CNG in the national capital on May 21 was hiked by Rs 2 per kg, the 13th increase in rates in just over two months.

CNG in the national capital territory of Delhi now costs Rs 75.61 per kg, up from Rs 73.61 per kg, according to the information posted on the website of Indraprastha Gas Ltd (IGL) -- the firm which retails CNG and piped cooking gas in the national capital and adjoining cities.