Can sewer gas enter my home from the City sewer lines?

Sewer gas can enter a building when the water in a trap in the building evaporates. All fixtures that are connected to the sewer system must have traps on them. The water that is normally retained in the trap forms a barrier to the migration of gases.

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1. What should I do when my sewer is backing up?
2. Can sewer gas enter my home from the City sewer lines?
3. I am not sure I should sewer this material. What should I do?