The Guardian hates log burners because they are a symbol of the affluent trendy middle class.
Article is mostly agenda-driven scaremongering - if you have a wood burner that's in good condition, the house has appropriate ventilation, & you don't load logs like an ape, nothing to worry about.
Scented candles are far more of a hazard.
I have an air quality monitor which measures PM1/2.5/10 & an open fire I burn wood on - There is absolutely no measurable decrease in air quality in the room with the fire going, because my chimney works.