RELATIVE CONTRIBUTION to atmospheric formic acid has been estimated as follows (Tg/yr): atmospheric chemistry, 30; formicine ants, 0.6; motor vehicles, 0.002; biomass and refuse combustion, <0.002. At 0.005 g formic acid/ant, this is rather remarkable. (1 Tg = 10(9) kg, 1 million kgs).
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