Residents of Delhi are breathing about 25 times more toxic air than the permissible limit according to
WHO (World Health Organization) guidelines, as on November 2019. Delhiites may live around 17
years less than their expected life based on the current average PM 2.5 level in the capital 1 . Clean air
is becoming a challenge in majority of growing economies.
Over the past years the National Capital has turned into a gas chamber with a blanket of thick smog
all over the city and its neighbouring areas filled with high level of PM 2.5. PM 2.5 is a micro pollutant,
just 3 percent the width of a human hair. It enters the bloodstream rapidly and creates cloths, blocking
the blood flow, and may lead to brain or heart attack, along with other diseases 2 . The AQI level
reached 1350 and the PM 2.5 level reached 999, in November 2019. PM 2.5 pollution contributed to
nearly 30 lakh early deaths in 2017, more than half of it in China and India. In the Indian capital, air
pollution has reached dangerous levels 3.
The non-profit study by Studio Symbiosis looks at a multitude of solutions to create a comprehensive
strategy to tackle and rectify this imminent threat, which is denying clean breathable air to the
residents of Delhi National Capital Region (NCR). Everyone who can afford is buying home air
purifiers but why is clean air becoming a luxury and only accessible to limited people?
Pollution in Delhi is generated due to internal factors of transport, construction, open landfills, thermal
power industry and diesel generators. Alongside external factors of stubble burning in the adjoining
states of Haryana and Punjab push the PM10 and PM2.5 into the NCR.
“Aũra” relates to distinctive atmosphere or quality that seems to surround and be generated by a
person, thing, or place. In Greek and Latin, it means breath, and this is what we are looking for to
have the residents of city of Delhi, being able to breathe clean and pure air.
Design of Aũra has been developed using principles of aerodynamics, to create a form that
propagates maximum surface area and increased wind speed for a robust and efficient performance.
Simulation studies were conducted to attain minimum resistance and maximum surface area to
achieve this optimum design. An elliptical geometry has been designed as the starting point, as this
gave us the minimum resistance, and also for the same reason is the geometry used for the wings of
an aircraft. The form was further developed by twisting the form, this twist in geometry channels the
wind along the surface of the tower in the z direction, thereby exponentially increasing the surface
These cleaning towers designed as 60 m and 18 m high respectively. They can intake polluted air
from 360 degrees. “Aũra” has two main chambers. One to increase the relative velocity of the air and
the other cleans the massive intake of air before sending it out at great speed and throw. The clean
colder air is coming out from the top enabling a greater throw in the atmosphere, travelling larger
distances. The cleaning tower designed at 18 m height is able to clean 30 million cubic meter of air
every day. Capacity to clean 1,115,000m3 per hour. An average adult working inhales around 16m3
of air over the course of an 8 hour working day.
The system works, by taking polluted air from the upper area of the tower, which travels vertically
within and is thrown out from the bottom of the tower. The section of Aũra further creates a
compression and acceleration of intake wind, thereby increasing wind velocity within.
The design of the tower consists of a triangulated component, to ensure ease of execution. Each
component is tapered in to create a compression of wind and thereby further increasing the air being
pushed in. Green planters are provided on the surface of the cleaning tower to produce more oxygen. This is a
system with integrated drip irrigation.
Aũra has been developed at four different systems, catering to different conditions of range and
varying atmospheric wind speeds.
The first scale of “Aũra” deals with stopping the external pollution entering the city of Delhi, by
fortifying the city through a series of 60-meter tall air towers placed in a ring along the city border. This
ensures in negating the pollution penetrating the city through this ring of clean air.
Days that record the highest pollution are the days when the wind velocity drops. Most of the cleaning
towers work with a natural draft of wind and with these tall towers with a 2.5 km cleaning range are
grafted within the city, they will have a reduced output during the time of peak pollution, as there is no
wind to push the pollution towards these towers.
Given this fact, a secondary system of “Aũra hotspots” have been designed to be grafted within the
city. These towers are designed as 18 meters high and they create a grid that ensures clean air in the
city. These hotspots are effective, even when the wind speed drops and the pollution level increases.
By placing these Aũra hotspots, we can ensure clean air throughout the city. These towers have a
smaller range of 1 sq km and are highly effective in cleaning the city during days with low wind
speeds and highest pollution levels. Hotspots for each neighbourhood where residents can enjoy
clean air in the evenings or on the weekend in close proximity.
The third system looks at objects in motion, moving through the city of Delhi. Given that we don’t want
to play with nature and generate artificial wind, a simple attachment on top of cars has been
designed. This element looks at the aerodynamics of a car and the streamlines as achieved during
computational fluid analysis, are being pushed through these “Aũra velocity”. This ensures that the
part of the problem becomes a part of the solution. The more these cars move in the city, the more
they clean the city. It is a design of inclusion, rather exclusion. So a scheme like odd even would not
need to be enforced as these cars will act as a hive of micro air purifiers. We are suggesting that cars
are equipped with the “Aũra velocity”. As a consequence, everyone who has inadvertently become a
part of the problem, will contribute as being a part of the solution.
The fourth system looks at a network of drones, flying through the city of Delhi. These “Aũra Falcon”
drones are components nested within the cleaning towers that detach and move around the city
guided by live updates of the pollution levels. They double up as cctv cameras with an added feature
This defensive and preventive network of “Aũra Hive”, looks at creating a clean future for the city of
Delhi and as well as various other cities around the globe. Clean air should be accessible to every
resident of the city and not only limited to people who can afford it.
Amit Gupta, Britta Knobel Gupta, Amit Agrawal, Kartik Misra, Sonal Dongre Jain, Dewesh Agrawal, Chinmay Chowdhary, Mandeep Chaudhary , Pallav Chaudhary, Keshav Sapra
“Aũra” Breathing Lungs of the City by Studio Symbiosis in India won the WA Award Cycle 33. Please find below the WA Award poster for this project.
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