Is bronchitis a bacteria infection or a viral infection?

Either... Acute bronchitis could be due to either a bacterial or viral infection whereas chronic bronchitis, a form of copd, is due to smoking.
Depends. Bronchitis is an inflammatory condition of the bronchial tubes. It can be broken down to infectious or non-infectious. Infectious causes include bacterial, viral and rarely fungal. Most commonly in an otherwise health adult, most bronchitis is viral (i.e. Untreatable with antibiotics.) non-infectious causes include allergens (pollens, molds, etc.) and irritants (smoke, chemicals, etc.).
Both. It can be due to either or. Most cases of infectious bronchitis are due to viruses though, and will not respond to antibiotics.

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