Combination airborne substance detector

A combination airborne substance detection apparatus comprising:

• (a) an enclosure having at least one opening;
• (b) a circuit board disposed within said enclosure;
• (c) a first electronic sensing device connected to said circuit board, said sensing device located near said at least one opening, said sensing device capable of continuously and independently detecting the presence of a quantity of a first airborne substance;
• (d) a second electronic sensing device connected to said circuit board, said sensing device located near said at least one opening, said sensing device capable of continuously and independently detecting the presence of a quantity of a second airborne substance;
• and
• (e) an alarm module capable of producing a continuous first perceivable audio and visual emission and a second perceivable non-audio emission, when said first substance and said second substance are detected at least one of simultaneously and near simultaneously.

A method of monitoring concentrations of airborne substances comprising:

• (a) continuously detecting the presence of a quantity of a primary airborne substance;
• (b) continuously detecting the presence of a quantity of a secondary airborne substance;
• and
• (c) implementing a continuous first perceivable audio and visual emission when said primary substance is detected and a second perceivable non-audio emission when said secondary substance is detected;
• wherein said first emission is implemented first followed by implementation of said second emission when said primary and secondary substances are at least one of simultaneously and near simultaneously detected.