Ya’an itself is not too hectic. It’s just the road out of the hills from Baoxing on. There’s a of industry based around stone, masonry, aggregate, concrete, etc. that keeps things pretty dusty. On top of the development of new hydroelectric and better roads to make the area more safely accessible.
Just means the stretch from Ya’an and through Lushan especially is a cluttered dustbowl. Especially the 2-way highway that drops down into Ya’an. They’ve also go construction of a tunnel to bypass the original highway underway.