St James's Park, central London, on 16 October 2017, when <a href="https://en.wikipedia.org/wiki/Hurricane_Ophelia_(2017)" class="extiw" title="en:Hurricane Ophelia (2017)">Hurricane Ophelia</a> caused dramatic visual effects owing to wind-borne Saharan dust and soot from major forest fires in Portugal.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/156154181@N07">Irid Escent</a>
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