Weihai

Cleanest air in eastern China by AQI — a small coastal Shandong city with substantial Korean tourism, the Liu Gong Island naval-history park, and the country's most-photographed coastal cycling route.

Weihai sits on the eastern tip of the Shandong peninsula, 235 km from Incheon, South Korea — the closest mainland Chinese city to Korea, and a substantial Korean-tourist destination. The city is consistently ranked the cleanest-air major city in eastern China by annual mean PM2.5; the surrounding coastline is undeveloped by Chinese standards.

Liu Gong Island, 4 km offshore, was the base of the late-Qing Beiyang Fleet that was destroyed by Japan in the 1894-95 Sino-Japanese War. The Liu Gong Island Sino-Japanese War Museum is the substantial site. The Huancui Lou (Embraced-Greenery Tower) on the city's west hill, and the 105 km Banyue Bay coastal cycling route, are the other major draws.