def _getAirRefrIdx360ppmC02(wl=0.532):
    """
    ret refractive index for air with 300 ppm of CO2
    getAirRefrIdx300ppmC02(wl=0.532)
    """
    return (8060.51 + 2481070 / (132.274 - wl ** -2) + 17456.3 / (39.32957 -
        wl ** -2)) / 100000000.0 + 1
