Is the sunlight in Japan brighter?

I realized that the sunlight in Japan is brighter and the sky seems to be more clear and blue than other Asian countries such as Taiwan, Hong Kong and Korea... anyone share the same view as me ?

Have you been in Japan and its neighboring countries during all the seasons?

I am asking because generally speaking, I find the sky in Japan (Pacific coast) bright and clear and beautiful in winter, but due to high humidity the visibility is often bad and the sky is rarely blue and bright during the warmer seasons.

I think it may possibly caused by KOUSA.
In the East Asia, there is the times under the influence of the dust from the Yellow River region in China.
In Japanese, it called KOUSA means the yellow dust.

yes, been to these East Asian countries during different seasons but only Autumn-Winter in Japan. Thanks Uji for the answer! visiting Japan again in Spring :)

Empirically I have no proof that the light is different but as a photographer there is a quality to the light in Japan that I have seldom seen elsewhere.

totally agree with stan. the sunlight of japan gives a certain warmth which truly matches with the warmth smiles of the japanese people :)