A NIMS guiding principle stating that each individual involved in incident management reports to and takes direction from only one person.

An increase in the central pressure of a low. Counter-clockwise wind flow around the low usually decreases as filling occurs.

An airborne dust, fume, gas, mist, odor, smoke, vapor, soot, pollen, carbon, acid or particulate matter or any combination thereof.

The general term referring to the undesirable addition of substances (gases, liquids, or solid particles) to the atmosphere that are foreign to the natural atmosphere or are present in quantities exceeding natural concentrations.

Graph showing the increase in temperature at a specified point in a fire as a function of time, beginning with ignition and ending with burnout.

The speed of an aircraft as shown on its pitot static airspeed indicator. Calibrated to reflect standard atmosphere adiabatic compressible flow at sea level, uncorrected for airspeed system errors.

A permanent source of air pollution that can be distinctly identified such as a smokestack.

Nautical miles per hour, equal to 1.15 mph.

Removal or killing of unwanted vegetation, residue, etc. by use of fire, herbicides, or mechanical treatment in preparation for reforestation and future management.

At a general level used to refer to the ability of a system (ecological or human) to resist damage and recover from a disturbance. In ecology, resiliency tends to refer to the ability of the system to return to the pre disturbance state with no assessment of whether that state is desirable or not. From a social perspective, resilience may reference ability to return to the original state but also can refer to the ability to recover to a state more likely to resist or recover quickly from future disturbance.