India suffers the worst air pollution globally. Home to 21 of the 30 most polluted cities in the world, this toxic pollution kills more than a million people annually.
That’s partially because the South Asian nation is the second largest producer of bricks in the world. Brick kilns, responsible for 20 percent of black carbon emissions worldwide, make a huge contribution to its dreadful air.
Indian architect Tejas Sidnal was shocked to discover the construction industry’s role in the pollution crisis. “That was a crazy eye opener,” he says. “As architects, we are responsible for so much air pollution. We can do better.”
Determined to make construction more sustainable and tackle India’s air pollution, Mr. Sidnal launched Carbon Craft Design in 2019. The startup takes black carbon extracted from polluted air and upcycles it to make stylish, handcrafted building tiles.
Dangerously high level of pollution
The air surrounding the cities of India mostly contains dangerously high levels of fine particulate matter, known as PM2.5, which is associated with lung and heart disease and can affect cognitive and immune functions. In 2019, after experiencing record levels of smog, the capital city of Delhi declared a public health emergency. PM2.5 includes black carbon, a substance which can absorb one million times more energy from the sun than carbon dioxide in the days or weeks it stays in the atmosphere.
Reducing pollutants such as black carbon could help slow global warming and improve air quality, experts say. Many companies are exploring the commercial potential of capturing carbon dioxide emissions, but few are focused on black carbon, according to Mr. Sidnal. “We found a way to add value to this recovered carbon by using it as a pigment in carbon tiles,” he says.
Carbon Craft Design collaborated with Graviky Labs, an Indian company that previously created “Air Ink,” a technology that collects and transforms carbon soot from cars and factories into ink and paint.
Graviky Labs uses a filter device to capture carbon soot from diesel exhaust and fossil fuel generators, removes contaminants such as heavy metals and dust from the soot, and gives the purified carbon to Carbon Craft Design in powder form.
“Graviky Labs views pollution as a resource,” company founder Anirudh Sharma said. “We are one of only a few companies in the world to capture these carbon emissions and turn them into new materials.”
Carbon Craft Design mixes the captured carbon with cement and marble waste from quarries to produce monochromatic tiles. Mr. Sidnal says the company aims to ensure each tile contains at least 70 percent waste material. It sells the tiles to architects and retailers for $29 per square meter which is a high price compared to regular ceramic tiles.
As the company scales up production, Mr. Sidnal hopes to lower prices and produce a cheaper range of carbon tiles. “We want to hit the affordable sector,” he says. “Sustainability is not only for the elite.”
Since launching its first tiles a year ago, Carbon Craft Design’s customers have included global fashion brands and architecture firms in India. In November 2020, the company retrofitted an Adidas store in the city of Mumbai, covering the walls and the floor with its carbon tiles.
Architect Manan Gala, whose firm designed the Adidas store, describes the carbon tile as a “winner” for the construction industry. As well as being sustainable, “the product has better strength than conventional cement tiles due to the carbon content, and the raw and rustic feel adds to the overall charm,” he says.
Carbon Craft Design is currently raising investment and hopes to start distribution in Europe this year, says Mr. Sidnal, adding that “we are swamped with inquiries from in and out of India.”