Hissing Miasma is an enchantment that says:
Whenever a creature attacks you, its controller loses 1 life.
Does the attacker lose one life per attacking creature?
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Yes (though they will be lost one at a time).
There's a rule specifically covering this:
603.2c An ability triggers only once each time its trigger event occurs. However, it can trigger repeatedly if one event contains multiple occurrences. See also rule 509.4.
If your opponent attacks you with an Elf and a Bear, two instances of the event "a creature attacks you" occurred (the Elf attacked you, and the Bear attacked you), so the ability will trigger twice.
You will place these on the stack where they will resolve one at a time, each causing him to lose one life (for a total of two).
Yes, the attacker will lose one life per attacking creature.
The ability is a triggered ability, because it uses the word "whenever". The trigger is a creature having attacked, and if 5 creatures attack, then this will trigger 5 times.
603.1. Triggered abilities have a trigger condition and an effect. They are written as "[Trigger condition], [effect]," and begin with the word "when," "whenever," or "at." They can also be expressed as "[When/Whenever/At] [trigger event], [effect]."