Ariz. Rev. Stat. § 49-422
A. In addition to any other powers vested in it by law, the department may:
3. Require, as specified in subsections B and C of this section, any source of air contaminants to monitor, sample or perform other studies to quantify emissions of air contaminants or levels of air pollution that may reasonably be attributable to that source, if the director either:
C. For those sources of air contaminants for which rules are not required to be adopted pursuant to subsection B of this section, the director may require a source of air contaminants, by permit or order, to perform monitoring, sampling or other quantification of its emissions or air pollution that may reasonably be attributed to such a source. Before requiring such monitoring, sampling or other quantification by permit or order, the director shall consider the relative cost and accuracy of any alternatives that may be reasonable under the circumstances such as emission factors, modeling, mass balance analyses or emissions projections. The director may require such monitoring, sampling or other quantification by permit or order if the director determines in writing that all of the following conditions are met:
F. On request of the on-scene commander or the department of health services, the department of environmental quality shall assist at a significant chemical or other toxic fire event, excluding chemical or nuclear warfare or biological agents, and shall provide the following services if funding is available and if the director, in the director's professional capacity, determines the department's provision of services is necessary to protect human health and the environment: