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In the smoke haze, the most abundant particles are around onemicrometre in size, but these particles do not change the colour of the light we see, there are also smaller particles, around 0.05 micrometres or less, that dont make up a lot of the haze but are still somewhat more abundant during a haze period [than a normal non-haze period]... but this is enough to give an extra tendency to scatter red light more in the forward and backward directions than blue light - and that is why would you see more red than blue.