Why Winter Skies Look “Whiter” in Cities — The PM2.5 + Light Scattering Science
• Winter skies appear whiter in cities due to PM2.5 particles scattering all colors of light equally.
• Temperature inversions and increased heating demand in winter exacerbate PM2.5 concentrations in urban areas.
• High PM2.5 levels not only reduce visibility but also pose significant health risks, especially respiratory issues.
Winter skies whiter in cities due to PM2.5
Winter in urban environments often brings a peculiar phenomenon: the sky appears whiter than usual. This isn't just a trick of the eye; it's a result of the interaction between particulate matter, specifically PM2.5, and light scattering. Understanding this phenomenon requires a dive into atmospheric science and the unique conditions present in cities during winter.
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