Question

Why are naturally occurring substances, such as particulates or carbon dioxide, sometimes considered pollutants?

Answer 1

Answer:

Because it is in such high concentrations that it cannot be compensated with its natural elimination process.

Explanation:

Substances like carbon dioxide are produced naturally by living beings in the breathing process. This carbon dioxide is taken by plants for their photosynthesis process, but currently, the carbon dioxide is also produced by the burning of organic materials in industries. The quantities that are produced are exceeding the capacity of the plants to transform it,  which causes gas to accumulate in the atmosphere damaging the ozone layer

Answer 2

Because despite being natural they still harm the ozone layer and cause breathing problems, even suffocation.