611208 The disclosure relates a chemical composition for generating carbon dioxide for use with an insect monitor and/or capture device comprising: an effervescent agent which is an alkaline carbonate salt, a solid acid, a deliquescent agent which is magnesium chloride hexahydrate and optionally an anticlumping agent. The solid acid is selected from the group consisting of citric acid monohydrate, maleic acid, malic acid, oxalic acid, malonic acid, tartaric acid, aspartic acid, fumaric acid, isophthalic acid, phthalic acid, terephthalic acid, salicylic acid, gentisic acid, gallic acid, mandelic acid, tropic acid, cinnamic acid, benzoic acid, nicotinic acid, phenylacetic acid, sorbic acid, 2-pyrrolidone-5-carboxylic acid, trimellitic acid, ptoluene sulfonic acid and benzene sulfonic acid. The anti-clumping agent is selected from the group consisting of fumed silica, amorphous silica, kaolin clay and mixtures thereof. molar ratio of effervescent agent to solid acid to deliquescent agent is from 159:52:1 to 10:3:1. The effervescent agent may comprise sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, ammonium carbonate, ammonium bicarbonate and calcium carbonate.
