Context:
A recent scientific explanation highlighted why the sky often appears pale grey or whitish during very hot days instead of deep blue. The phenomenon is linked to increased moisture, dust, aerosols, and changes in the scattering of sunlight in the atmosphere
- Sunlight consists of multiple colours with different wavelengths forming the visible spectrum.
- Rayleigh scattering occurs when atmospheric particles are much smaller than the wavelength of visible light.
- Shorter wavelengths like blue and violet scatter more strongly than longer wavelengths, making the sky appear blue.
- On hot days, warmer air can hold greater moisture and suspended particles such as dust, aerosols, smoke, and water droplets.
- Larger particles cause Mie scattering, where all wavelengths scatter more uniformly instead of predominantly blue light.
- This reduces the dominance of blue colour and produces a whitish or grey haze in the sky.
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