Final answer:
Asthma attacks can occur at any time but are often triggered by environmental factors, exercise, and stress.
Step-by-step explanation:
When do asthma attacks usually occur?
Asthma attacks can occur at any time, but they are often triggered by certain factors. Common triggers include
environmental factors
such as air pollution, allergens, smoke, and cold air. Additionally,
exercise
and
stress
can also trigger asthma attacks. It is important for individuals with asthma to identify their triggers and take preventive measures.