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You're mixing things a bit.
Sustainable is about not diminishing the fuel source, fossil fuels are not sustainable because we can't replace them as quickly as we use them. We can with wood, especially fast growing soft woods like pine. Sustainability does not affect air quality.
Cleanliness and pollution is about how much crap goes into the atmosphere. This affects air quality.
You can get ones that are Defra approved, and I suppose smokeless coal, but burning logs is burning logs, however the Norwegians manage to do it sustainably, but London is London with X million occupants and air quality is an issue. Still I've never worked out the carbon footprint of wood burner in best sustainable mode vs regular gas fired heating.