Erratum for the Research Article: “Agriculture is a major source of NOx pollution in California” by M. Almaraz, E. Bai, C. Wang, J. Trousdell, S. Conley and I. Faloona, B. Z. Houlton

In the article “Agriculture is a major source of NOx pollution in California,” individual data values in table s1 and s3 of the Supplementary Materials were entered incorrectly. The fertilizer rate for wheat in table s1 wrongly read 617 kg/N/ha/yr, and the Fo/zi Emission column of table s3 incorrectly stated the same value throughout. The table s1 wheat data was corrected to 198 kg/N/ha/yr, and the table s3 Fo/zi Emission column was corrected with all new values. The PDF version of the paper was corrected 8 June 2018.