The pound has wiped out almost all its declines against the dollar this year as recent surveys signaled pro-EU voters pulling ahead. Expected volatility also comes from increased speculation that the Federal Reserve will increase interest rates on June 15. The pound’s one-month volatility versus the dollar jumped to its highest level since 2010, as the measure began to reflect trading activity in the days following the results of Britain’s June 23 vote on whether to leave the European Union. Opinion polls and betting odds on whether the “remain” camp or the “leave” group will prevail in the referendum have dictated moves in the currency in recent months. One-month pound-dollar implied volatility rose more than five percentage points to 16.53 percent as of 4:35 p.m. in London, data compiled by Bloomberg show. The level was the highest since May 2010 on a closing basis.