Fig. 1: Words used by participants to describe changes after the intervention.

These word clouds depict a qualitative summary of the free-text participant responses to questions about whether their (a) thinking and (b) behavior had changed regarding ventilation. Larger and more central words are those mentioned most frequently. In the (a) word cloud responding to whether their thoughts had changed, the most commonly used word by far was “yes”, with other commonly used words including topical words such as ‘cooking’, ‘fan’, ‘time’, ‘aware’ and ‘pollution’. In the (b) word cloud responding to whether their behavior had changed, the responses are less definitive (yes is no longer the most common word), with words indicating uncertainty showing up more prominently (e.g. “try”, “suspect”, “trying” and “unrealistic”). References to increased time using various interventions were common with mentions of both back burners and range hoods.