It would take the French.
A tethered gas balloon in Paris's 15th arrondissement has been taking tourists up for aerial views of the city since 1999. Now, it has been coupled to an air quality monitoring and display system, to give real time information on air quality in the city and at major traffic junctions.
Sensors will monitor levels of nitrogen dioxide, ozone, and particulate matter. And, if we understand this correctly, 'Ballon Air de Paris' will change colour depending on air quality: red for highly polluted air, through to yellow for 'mediocre', and green for very clean.
Perfect, you'd have thought, for keeping an eye on air quality in Beijing in the run up to the Olympics? No, you're right. It would never take off!
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