smoke, perfumes), outdoor pollutants (ozone, sulfur dioxide, nitrogen dioxide, carbon monoxide) and strong odors (perfumes, scented sprays, fresh paint, moth balls).
[theasthmacenter.org]
Other triggers include irritants like cigarette smoke and stimuli such as exercise, cold weather and infections.
[sharecare.com]
For example, if your child’s airways are already extra-irritated by a cold, being around irritants like cigarette smoke can add to the problem.
[rileychildrens.org]