Most stations are
collocated with PM2.5
speciation samplers, and some also include PAMS measurements. |
|
Recently, the list
of pollutants monitored at NATTS sites was expanded to include polycyclic
aromatic hydrocarbons (PAHs), of which naphthalene is the most prevalent. |
|
All sites follow QA
programs for sampling and siting. |
|
Periodic refinement
of pollutants and/or sampling may be made (e.g., EPA plans to re-evaluate the
program every six years). |
|