What Qualifies a Fire as 1-Alarm, 2-Alarm, etc.?

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I see this on the news a lot: “a 3-alarm fire occurred today at . . .”.

How many firefighters, vehicles and fire companies (I think they’re called Ladders) are involved in a 1-alarm fire?

What qualifies a fire as a 2-Alarm, 3-alarm, etc. fire?

I’m guessing there are actual numbers of personnel and/or equipment that qualifies a fire as 1-Alarm, 2-Alarm, etc.

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