Yes, the atmospheric pressure will affect the rate of boiling. In higher altitude locations, water requires a lower temperature to boil. This phenomenon is because the air pressure is lower at those heights. The higher the elevation, the lower the air pressure, and thus, the lower the required temperature for boiling. Similarly, when there is greater air pressure, such as that of a pressure cooker, the temperature would have to be higher in order to bring the water to a boil.