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There is growing evidence that asthma symptoms can be aggravated or events triggered by exposure to indoor nitrogen dioxide (NO₂) emitted from unflued gas heating.

The impact of NO₂ on the respiratory health of children with asthma was explored as a secondary analysis of a randomised community trial, involving 409 households during the winter period in 2006 (June to September).

Geometric mean indoor NO₂ levels were 11.4 μg·m⁻³, while outdoor NO₂ levels were 7.4 μg·m⁻³. Higher indoor NO₂ levels (per logged unit increase) were associated with greater daily reports of lower (mean ratio 14, 95% CI 1.12–1.16) and upper respiratory tract symptoms (mean ratio 1.03, 95% CI 1.00–1.05), more frequent cough and wheeze, and more frequent reliever use during the day, but had no effect on preventer use. Higher indoor NO₂ levels (per logged unit increase) were associated with a decrease in morning (-17 …