台十五線(濱海路)及台六十一線(西海快速) 空氣好嗎?

打算行走台十五線(濱海路)及台六十一線(西海快速)作環台的首天路程, 請問是行經新竹時, 空氣質素如何? 同行台一線空氣比較, 那條線好?

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