Why is the weather red today?

The sun is near the horizon. The weather on August 12, 2022 is red because the sun is close to the horizon, and the thickness of the atmosphere that sunlight needs to pass through is several times thicker than that at noon. According to the principle of Rayleigh scattering, blue light with short wavelength is almost scattered, while red light has the longest wavelength and the longest propagation distance, so the final dominant color will be red light.