Boyle Heights Warehouse Fire Preliminary Air Monitoring Data: June 23 – 29
Lineage is sharing this preliminary air monitoring data in connection with the Boyle Heights warehouse fire response, which is being collected by a third-party firm (Onterris) in coordination and with oversight by SCAQMD. The information below summarizes handheld real-time air monitoring readings collected between June 23 and June 29, 2026, and includes both a data table and location-based monitoring maps.
These materials are being provided to support transparency and help keep community members informed. The data are preliminary, have not undergone the full quality assurance and quality control process, and should be reviewed with that context in mind. Community members should continue to follow guidance from local public health agencies and emergency response officials.
Air Monitoring Data Summary
| Analyte | Number of Readings |
Number of Detections |
Minimum Concentration |
Maximum Concentration* |
|---|---|---|---|---|
| Carbon Monoxide (CO) | 216 | 0 | < 1 ppm | < 1 ppm |
| Hydrogen Sulfide (H2S) | 25 | 0 | < 0.1 ppm | < 0.1 ppm |
| %LEL | 209 | 0 | < 1 % | < 1 % |
| Ammonia (NH3) | 218 | 0 | < 1 ppm | < 1 ppm |
| Nitrogen Dioxide (NO2) | 21 | 0 | < 1 ppm | < 1 ppm |
| Oxygen (O2) | 148 | 148 | 20.9 % | 21.2 % |
| Fine Particulate Matter (PM2.5) |
959 | 959 | 0.001 mg/m³ | 0.149 mg/m³ |
| Coarse Particulate Matter (PM10) |
824 | 824 | 0.002 mg/m³ | 0.153 mg/m³ |
| Sulfur Dioxide (SO2) | 24 | 0 | < 0.1 ppm | < 0.1 ppm |
| Volatile Organic Compounds (VOCs) |
210 | 1 | 0.1 ppm | 0.1 ppm |
Abbreviations: ppm = parts per million; mg/m³ = milligrams per cubic meter
Note: This is a preliminary data summary, indicating that the data provided have not undergone the full quality assurance and quality control (QA/QC) process and should be considered preliminary at this time.
*Analytes with no detections are reported as less than (“<”) the instrument’s Limit of Detection (LOD)
Air Monitoring Location Maps
Coarse Particulate Matter Monitoring Locations
PM10 readings by monitoring location, including reported concentration ranges.
Fine Particulate Matter Monitoring Locations
PM2.5 readings by monitoring location, including reported concentration ranges.
Other Air Monitoring Results: No Detections or Normal Range
CO, H₂S, %LEL, NH₃, NO₂, O₂, and SO₂.
Volatile Organic Compound Monitoring Locations
VOC readings by monitoring location, including detected and non-detected results.
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