def METHOD_NAME(d):
    """
    Converts all barometric pressure values in a dict to "inches of mercury."
    :param d: the dictionary containing metric values
    :type d: dict
    :returns: a dict with the same keys as the input dict and values converted
        to "Hg or inHg (inches of mercury)
    Note what OWM says about pressure: "Atmospheric pressure [is given in hPa]
    (on the sea level, if there is no sea_level or grnd_level data)"
    """
    result = dict()
    for key, value in d.items():
        if value is None:
            continue
        result[key] = round((value / HPA_FOR_ONE_INHG), ROUNDED_TO)
    return result