Four months without the 'pong'

It's now been four months here, with open windows and I'd not had a whiff of the Silverdale tip 'pong'. This, as many local will recall, was the 'bad eggs' pong was drifting down into the valley and across Stoke, causing so much concern a year ago. Can we hope that it's finally gone, at least for those not living on the rim of the tip?