import math


def actual_pressure(temperature, pressure, height=0.0):
    """
    Convert the pressure from absolute pressure into sea-level adjusted
    atmospheric pressure.
    Uses the barometric formula.
    Returns the mean sea-level pressure values in hPa.
    """
    temperature = temperature + 273.15
    pressure = pressure * 100
    g0 = 9.80665
    M = 0.0289644
    R = 8.31432
    lapse_rate = -0.0065
    return "%0.2f" % (pressure / math.pow(
        temperature / (temperature + (lapse_rate * height)),
        (g0 * M) / (R * lapse_rate)) / 100)