TinyTim:mattwnz: I think cars produce more toxic fumes than woodburners,
From Victoria University: Wood burning fires a winter health hazard
"Travis didn’t expect his research results to show that, particularly in Auckland, wood burning fires contributed more particle pollution than vehicle emissions in the winter months.
'That was a surprise, especially because most people think road transport is the leading cause of air pollution.' "
They did say it was a surprise. However that would include all types of wood burners and open fires too. The new ones, and pellet fires, are far more efficient than fires sold even 10 years ago, and these newer ones would be in the minority.