Name 5 common asthma triggers.
1. Air Pollution - exposure to environmental contaminants like smoke, smog, or other sources of polluted air can trigger asthma symptoms.

2. Allergens - certain substances like pollen, mold, dust mites, and pet dander can trigger an allergic reaction resulting in asthma symptoms.

3. Cold Air - for some asthmatics, breathing in cold air can cause the airways to narrow, leading to an asthma attack.

4. Exercise - physical exertion, especially in cold or dry air, can trigger asthma symptoms in some people. This is known as exercise-induced asthma.

5. Stress - strong emotions and stress can trigger asthma symptoms in some people, possibly due to changes in breathing patterns and the release of stress hormones.
Complete the following task based on the instruction and optional input provided.### Instruction:
Name 5 common asthma triggers.

### Output:
1. Air Pollution - exposure to environmental contaminants like smoke, smog, or other sources of polluted air can trigger asthma symptoms.

2. Allergens - certain substances like pollen, mold, dust mites, and pet dander can trigger an allergic reaction resulting in asthma symptoms.

3. Cold Air - for some asthmatics, breathing in cold air can cause the airways to narrow, leading to an asthma attack.

4. Exercise - physical exertion, especially in cold or dry air, can trigger asthma symptoms in some people. This is known as exercise-induced asthma.

5. Stress - strong emotions and stress can trigger asthma symptoms in some people, possibly due to changes in breathing patterns and the release of stress hormones.