The Great Air Freshener of Huddersfield

Thank you to my friend Loz for alerting me to the fact that I’m not the only person with a frightening air freshener.
Apparently, he was on Huddersfield railway station recently and noticed what appeared to be smoke billowing from an orifice.
But, on taking a closer look, he noticed a sign declaring –
There is not a fire. This is an air-freshening system.