The study, which utilized advanced spectrometry and high-altitude balloons, confirms that Rayleigh scattering is the primary cause of the blue appearance of the sky during daylight hours.

Additional observations from mountainous regions suggest that altitude plays a significant role in the perceived saturation of the blue spectrum, supporting the light scattering model.

Data collected during recent volcanic events shows that while particulate matter can shift colors, the underlying Rayleigh scattering remains the constant baseline for sky color.