The Central Bank yesterday blamed market speculation for the steep rise in the local currency, and urged exporters and financial institutions to stay calm and stop panic sell-offs to avoid hurting their own profitability. The nation's top monetary policymaker said that it would step in, if necessary, to maintain order and stability in the foreign exchange market. The remarks came as the NT dollar yesterday closed up NT$0.919 to NT$30.145 against the US dollar in Taipei trading, after rising as high as NT$29.59 in intraday trading. The local currency has surged 5.85 percent against the greenback over the past two sessions, Central Bank data showed.