Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Follow the discharge instructions given by the emergency department, poison center, or treating clinician.
Rest and avoid smoke, vaping, aerosol sprays, and strong chemical fumes while breathing symptoms are settling.
Call emergency services immediately for:
And for anyone, someone who:
Seek prompt medical assessment after an exposure if symptoms are new, persistent, or worsening.
This includes repeated coughing, wheezing, chest discomfort, vomiting, trouble swallowing, significant eye pain, or blurred vision.
Routine medical follow-up is appropriate if cough, wheezing, chest tightness, unusual tiredness, or reduced exercise tolerance continues after the exposure.
A clinician may check lung function and decide whether further testing or respiratory treatment is needed.
Eye or skin burns may require follow-up with an eye specialist or burn-care team.
The article also says
Do not drive yourself if breathing is difficult, vision is affected, or you feel faint.
Symptoms can worsen during travel.
Every sign above is quoted from the sofidex article on Chlorine poisoning. If you are not sure, err upward — it is always reasonable to be checked.