Inconsistencies undermine the conclusion that agriculture is a dominant source of NO <sub><i>x</i></sub> in California.

Maaz, Tai McClellan; Waldo, Sarah; Bruulsema, Tom; Mikkelsen, Rob · Sci Adv · 2018

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Abstract

Almaraz <i>et al</i>. reported that agricultural soils are a dominant source of NO <sub><i>x</i></sub> pollution in California (20 to 32% of total statewide NO <sub><i>x</i></sub> emissions). However, this conclusion may be undermined by the lack of agreement between their modeled estimates and previously reported empirical measurements, the extrapolation of NO <sub><i>x</i></sub> fluxes during hot moments to derive annual estimates, and the overestimation of nitrogen fertilizer consumption in California.