Requires any owner or operator of an air pollution source to maintain records, draft reports, sample emissions and other monitoring procedures.

The sap and bark from the pulp logs was a major pollution source in the lower river.

In situ sampling devices are set up at increasing distances from the pollution source in the case of point source pollution.

A point source has negligible extent, distinguishing it from other pollution source geometries.

Identifying, regulating and upgrading single point pollution source such as a power plantor replacing a plant altogethermay also be more practical.