|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.
of pollutants and/or sampling may be made (e.g., EPA plans to re-evaluate the
program every six years).