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. 2024 Nov 20;14:28725. doi: 10.1038/s41598-024-78361-y

Table 3.

The 2022 California emissions Projection Analysis Model (CEPAM) NOx emission inventory and our estimated soil NOx adjustments for Imperial County and the Coachella Valley, as well as for the combined SSAB, are shown. The CEPAM inventory is based on an annual average, so we averaged our soil source estimates for our sampling duration. Also shown are the adjustments to the NOx inventory based on the average results from our field sampling campaign. The EPA’s National emissions Inventory (NEI) for 2020 is also shown for comparison for Imperial County only.

Source type NEI (2020) CEPAM (2022) This Study
Imperial County (tons/d) Imperial County (tons/d) Coachella valley (tons/d) SSAB total (tons/d) Imperial County (tons/d) Coachella Valley (tons/d) SSAB total (tons/d)
Mobile 11.9 (72.7%) 12.4 (81.8%) 15.9 (88.2%) 28.3 (85.2%) 12.4 (56.7%) 14.7 (69.9%) 28.2 (62.1%)
Biomass burning 0.5 (3.1%) 0.1 (0.9%) 0.7 (4.0%) 0.8 (2.4%) 0.1 (0.6%) 0.6 (3.2%) 0.9 (1.9%)
Stationary 1.3 (8.0%) 1.7 (11.4%) 1.3 (7.4%) 3.0 (9.0%) 1.7 (7.9%) 1.4 (5.9%) 3.1 (6.7%)
Biogenic Soil 2.7 (16.2%) 0.9 (5.9%) 0.1 (0.4%) 1.0 (3.0%) 6.7 (34.7%) 4.7 (21.0%) 11.4 (29.2%)
Total NOx 16.3 15.2 18.0 33.2 21.8 22.7 45.5