We know that the sky is blue due to Rayleigh Scattering. We know that Rayleigh Scattering is dependent on the size of the particles in the atmosphere. We know that pollution is made up of particles, and these particles can interact with and destroy ozone particles in the air.
If the particles in the atmosphere are being destroyed, and new ones, presumably with a different size, are being added, does this change the color of the sky? (Assume the sun is directly overhead and there are no clouds.)