What characterizes non-point source pollution?

Non-point source pollution is characterized by pollution that comes from multiple sources rather than a single identifiable source. Unlike point source pollution, which can be traced to a specific discharge point such as a pipe or factory, non-point source pollution is diffuse and results from various activities across a broad area. This type of pollution can arise from agricultural runoff, urban stormwater, and even atmospheric deposition, making it challenging to manage. Consequently, controlling non-point source pollution often requires a comprehensive approach that considers land use practices and community-level management strategies.

The other options do not accurately describe non-point source pollution. For instance, pollution from a single identifiable source describes point source pollution, while detection ease is not a distinguishing feature of non-point sources. Likewise, while heavy rainfall can exacerbate non-point source pollution by mobilizing runoff, it is not a defining characteristic, as non-point sources can be present under a variety of conditions.