Studio Symbiosis has designed A?ra air-purifying towers for Delhi, India, to help tackle the increasingly dangerous levels of pollution in the city.
Described by Studio Symbiosis as "breathing lungs of the city", the A?ra towers have tapered, twisting forms designed to draw in polluted air and expel it in a purified form.
The proposal responds to increasing levels of thick smog in Delhi that the studio says feels like "a gas chamber", which can be attributed to industrial waste, diesel vehicles, crop burning and power plants.
"Residents of Delhi are breathing about 25 times more toxic air than the permissible limit according to the World Health Organization guidelines, as on November 2019 according to India Today," explained Studio Symbiosis. "Everyone who can afford to is buying home air purifiers but why is clean air becoming a luxury and only accessible to limited people""

Studio Symbiosis has developed two different sizes of A?ra towers. The smallest measures 18 metres in height, while the larger tower is 60-metres-high.
The 60-metre-tall air tower relies on strong winds and is intended to be combined with several other towers to form a ring around the city's border that acts as a barrier to external pollution.
Meanwhile, the smaller towers act as a secondary system placed within the city's perimeter to maximise clean air during days when wind speeds are low and pollution is high.

Internally, both towers are divided into tw...