What qualifies as excessive noise?

No person in a residential zone shall emit noise beyond the boundaries of his/her premise exceeding the levels stated herein and applicable to adjacent residential, commercial or industrial zones:
Emitter’s Zone: Residential
Receptor’s Zone
Maximum Level
(dBA)
Industrial
62
Commercial
55
Residential/day
55
Residential/night
45
No person in a commercial zone shall emit noise beyond the boundary of his/her premise exceeding the levels stated herein and applicable to adjacent residential, commercial or industrial zones:
Emitter’s Zone: Commercial
Receptor’s Zone
Maximum Level
(dBA)
Industrial
62
Commercial
62
Residential/day
55
Residential/night
45
No person in an industrial zone shall emit noise  beyond the boundary of his/her premise exceeding the levels stated herein and applicable to adjacent residential, commercial or industrial zones:
Emitter’s Zone: Industrial
Receptor’s Zone
Maximum Level
(dBA)
Industrial
70
Commercial
66
Residential/day
61
Residential/night
51