THE Clean Air Act of 1999 (RA 8749) defines an air pollutant as any matter that is detrimental to health, such as dust, soot, cinders, fly ash, etc. Since noise is not matter but energy, it is not legally actionable. It is good, however, that the same Clean Air Act classifies noise as an emission, i.e., unwanted sound from a known source that is passed into the atmosphere and, therefore, actionable.

Considering the continuing wonders in light technology development we read about and see on TV and portable screens nowadays, light pollution could emerge as an environmental problem.