ISLAMABAD - Prices of petroleum products (POL) except of diesel are likely to witness a hike up to Rs 2.50 per litre while final decision is expected today. New prices will be effective from January 22. Petrol is to be raised by Rs 1.10 per litre, HOBC Rs 2.50, Kerosene Rs 0.85 and Light Diesel Oil (LDO) Rs 0.60/liter while price of High Speed Diesel (HSD) oil would be maintained at current level, sources said.