As cities sprawl over more land, air quality has become a pressing concern. Industries generate fine particles, usually from burning fuel or wood, that according to Dutch startup Envinity Group are the "greatest threat to public health," and air pollution is responsible for at least 400,000 deaths every single year. Envinity Group designed what they call the world's first huge outdoor air vacuum to suck up these toxic particles. Envinity Group unveiled their device at the Offshore Energy 2016 Exhibition & Conference in Amsterdam.