. 2018 May 15;6:e4759. doi: 10.7717/peerj.4759

Table 1. July to August average reactive nitrogen concentrations (ppb) and the NH₃ and ${NH}_{4}^{+}$ fraction for the total oxidized and reduced nitrogen for multiple years of measurements made at RMNP.

The FRAPPÉ study year is highlighted in bold for ease of comparison.

	NH₃	${NH}_{4}^{+}$	HNO₃	${NO}_{3}^{-}$	NO_y	${NH}_{4}^{+}$ fraction	NH₃ fraction
2009	0.47	0.37	0.10	0.07	1.74	14%	18%
2010	0.38	0.32	0.09	0.05	1.21	17%	20%
2014	0.34	0.20	0.06	0.03	1.05	12%	21%
2015	0.43	0.21	0.10	0.04	1.36	11%	22%
2016	0.58	0.25	0.07	0.03	1.22	12%	28%

Table 1. July to August average reactive nitrogen concentrations (ppb) and the NH3 and NH4+ fraction for the total oxidized and reduced nitrogen for multiple years of measurements made at RMNP.