Construction in a city means the usual mix of dust, diesel fumes, and the 6 a.m. sound of drills drilling where your dreams used to be. But in Jinan, China, officials went with something different: they put the whole site inside what might be the world’s largest inflatable dome.

The dome stands 50 meters tall and spans 20,000 square meters, making it larger than three football fields and taller than a 15-story building. According to Chinese authorities, the goal is to trap dust, contain sound, and cut down on the environmental fallout that usually spreads far beyond the construction fence.

A viral time-lapse shows the dome inflating over the construction site, drawing comments from people both impressed and confused. “How do you even make a sheet that big?” one user asked. The answer involves industrial fans, high-grade filtration, and a whole lot of negative pressure—all designed to keep dust in and clean air circulating inside.

China Uses World’s Largest Inflatable Balloon to Make Construction Cleaner and Quieter

The dome was revealed in a July 2 Facebook post by Foreign Ministry spokesperson Mao Ning and is the first of its kind in China. It’s made from transparent, PVDF-coated polyester, which is tough enough to hold shape but clear enough to let in natural sunlight. That means the site stays lit during the day without relying on electricity. No beams, no scaffolding. Just four big fans, constant air pressure, and a lot of engineering confidence.

“It’s such a clever way to protect both the environment and the people living nearby,” said one commenter, capturing what Chinese officials have been aiming for all along: sustainable construction in a country that’s long struggled with pollution around large-scale projects.

The design is modular and mobile. Once construction wraps, the dome can be deflated, packed up, and shipped off to the next site. Local officials say if the Jinan trial goes well, similar domes could be deployed nationwide.

What it’s actually like to work inside a massive plastic balloon hasn’t been widely reported yet. But if this massive marshmallow of urban planning works as promised, we may be looking at the future of construction—sealed off, pressurized, and surprisingly graceful.