The Documentary Podcast Folgen

Air Pollution is responsible for around seven million deaths every year. Governments around the world have been trying to tackle it with a variety of measures. But now, the fight against air pollution is increasingly catching the imagination of artists and designers. In Al Hudayriyat Island in Abu Dhabi, a 7m high installation, Smog Free Tower by Dutch Studio Roosegaarde, bills itself as "the world's first smog vacuum cleaner." It purifies 30,000 cubic metres of air per hour and the dirt filtered from this urban smog is compressed into jewellery - Smog Free Ring - and sold to finance the project. In Delhi and Bangalore, AIR INK is "turning air pollution into ink solution" by capturing the black particles that float in the atmosphere and turning them into ink. Founder Anirudh Sharma and his co-founder Nikhil Kaushik, say taking air pollution and turning it into ink means the more AIR INK on your page, the less pollution in your lungs.

The so-called ‘parents’ revolution’ is happening in America - and it’s a revolt against the public education system. School choice campaigns are gaining ground across the country, fighting for tax-funded vouchers giving parents the opportunity to select their preferred school. More and more families are ditching institutions altogether, with homeschooling reportedly the fastest growing form of education in the US. Why are families turning away from traditional schooling, and what does this mean for the future of America’s education system? Alex Last travels to Arizona - a state at the forefront of the school choice movement - to find out more.

The Norwegian artist Edvard Munch is best known for his expressionist painting The Scream. A pastel version of it fetched $ 120 million when it was last auctioned in 2012, making it the most expensive piece of art ever sold at an auction. The art exhibition Edvard Munch: Trembling, shifts the focus to his landscape paintings, revealing a very different side of the artist and showing the vivid colours he used. Presenting this exhibition on both sides of the Atlantic - in the US, then in Germany and Norway - makes the show open up to a wider audience. But what does it take for an exhibition to go on a journey? The Museum Barberini in Potsdam, Germany grants the BBC exclusive access to witness what happens behind closed doors, when art works worth millions move across countries.