Contribution of oil/gas emissions to PM_2.5 budget. Contribution of oil/gas emissions (calculated as the difference between control run (CTRL) and (T1, no emissions) to surface PM_2.5(a, c) and partial 1000 m column (b, d) of average diurnal PM_2.5 on 19 (left) and 20 July 2012. A3 and A4 are the areas used to calculate the average enhancements reported in Tables 5 and 6. DOI: https://doi.org/10.1525/elementa.124.f10