Flare

BAAQMD Refinery Flare Emission Report
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Marathon / Tesoro - Main Refinery
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April - 2026
Date Vent Gas Flow Methane NMHC Sulfur Dioxide
(mo/day/yr) (volume in SCFD) See note **** (lbs) (lbs) (lbs)
4/1/2026 0.00 71.71 0.00 0.00
4/2/2026 0.00 71.42 0.00 0.00
4/3/2026 0.00 71.21 0.00 0.00
4/4/2026 2,896.34 71.12 0.31 0.00
4/5/2026 0.00 71.03 0.00 0.00
4/6/2026 0.00 71.15 0.00 0.00
4/7/2026 0.00 70.99 0.00 0.00
4/8/2026 0.00 70.88 0.00 0.00
4/9/2026 0.00 70.85 0.00 0.00
4/10/2026 0.00 70.79 0.00 0.00
4/11/2026 136,738.71 21.97 12.12 0.06
4/12/2026 17,381.17 70.70 1.63 0.02
4/13/2026 0.00 70.33 0.00 0.00
4/14/2026 389,826.41 77.58 36.15 1.64
4/15/2026 538,969.30 119.43 49.07 2.47
4/16/2026 714,260.76 213.20 65.34 3.60
4/17/2026 690,899.86 213.15 65.03 4.16
4/18/2026 706,813.05 224.45 61.55 4.13
4/19/2026 900,693.14 250.17 79.06 5.52
4/20/2026 1,007,567.99 279.31 101.12 9.48
4/21/2026 622,731.37 201.22 60.71 15.42
4/22/2026 626,292.38 205.88 58.16 5.26
4/23/2026 449,575.96 159.68 41.37 2.14
4/24/2026 0.00 69.80 0.00 0.00
4/25/2026 381,338.21 41.41 34.48 0.33
4/26/2026 111,961.51 11.24 9.80 0.20
4/27/2026 118.53 69.56 0.01 0.00
4/28/2026 2,686.75 69.55 0.25 0.00
4/29/2026 0.00 69.62 0.00 0.00
4/30/2026 0.00 69.81 0.00 0.00
4/31/2026 0.00 69.94 0.00 0.00
April Totals 7,300,751.44 3,289.15 676.16 54.43
  • * Natural gas is used for both pilot and purge gas for the refinery flare system, except for the Emergency Flare uses nitrogen as purge gas.
    The flow is determined using an orifice calculation based on the orifice size in the lines and the line pressure upstream of the orifice.
    ** North and South Steam Flare is out of service
    *** Vent Gas Flow is vent gas to air flares and DCU flare instead of sum of flare header flows
    P&P, Vent Gas Emissions were modified to include methane from purge and pilots, using 98% and 99.5% respectively.
    During flaring, purges are part of vent gas flow.
    Camera 1
Marathon / Tesoro Main Refinery Flare Report 4/1/2026 - 4/30/2026
 
 

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Last Updated: 4/13/2023