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Dates of poor air quality (AQ), coinciding in London and Paris during 2014
| AQ1 | AQ2 | AQ3 | Total AQ days | |
| London | 8 March 2014 to 14 March 2014 | 28 March 2014 to 4 April 2014 | 16 September 2014 to 20 September 2014 | 15 |
| Paris | 6 March 2014 to 15 March 2014 | 31 March 2014 | 24 September 2014 | 12 |
