Escape the summer heat at Limutai Scenic Spot in Jizhou, north China's Tianjin. With over 90% forest coverage and a well-preserved primeval ecosystem, Limutai serves as a key air monitoring site and helped earn Jizhou its designation as Tianjin's first China Natural Oxygen Area. Negative oxygen ion concentrations here range from 2,000 to 26,000 per cubic centimeter, making the mountain air exceptionally fresh. Take a deep breath and let yourself become one with nature.