def pmtcorrection(x_humidity):
    """
    Correction factor for low budget pm sensors data based on the research paper 'Developing a Relative Humidity Correction for Low-Cost Sensors Measuring
    Ambient Particulate Matter' by Di Antonio et al.
    k: the degree of hygroscopicity of a particle.
    x_humidity: relative humidity, provided by the sensor.

    """
    k = 0.6
    aw = x_humidity/100
    return (1 + ((k/1.65)/(-1 + (1/aw))))