Just seen this on Sky News. Two women waving net type things about and putting the 'air' they've 'caught' into jars, where it's then sold at £80 a pop. Big in polluted China apparently.
http://news.sky.com/story/1641748/family-business-sells-bottled-air-to-china
http://news.sky.com/story/1641748/family-business-sells-bottled-air-to-china