As in recent years I had a look on the fine-particle concentrations of the Hamburg air quality measurement network during the fireworks. Especially with the ongoing discussion about the Diesel scandal I guess we might want to reconsider this habit... Keep in mind that the graph shows a moving average over 24 hours so the actual concentrations were much higher.
Update: There appears to be an issue with embedding Tableau-Charts in Squarspace. You can find the interactive Version here.