Boyle Heights Response & Recovery

Abbreviations: ppm = parts per million; mg/m³ = milligrams per cubic meter; AQI = air quality index; AEGL-1 = 1-hour Acute Exposure Guideline Levels; NAAQS = National Ambient Air Quality Standard

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). All O₂ levels were similar to ambient conditions, and no detections were observed for atmospheric flammability as a percentage of the lower explosive limit.

^†Based on the highest reading observed during roaming air monitoring operations or the highest average observed at stationary air monitoring locations, whichever is larger.

*Reading was elevated but not sustained.

**California Office of Environmental Health Hazard Assessment (OEHHA) Acute Reference Exposure Levels (RELs) are listed concentration levels at or below which no adverse health effects are anticipated for a 1-hour exposure duration. As stated by OEHHA, “RELs are designed to protect the most sensitive individuals in the population by the inclusion of margins of safety,” and that “margins of safety are incorporated to address data gaps and uncertainties, exceeding the REL does not automatically indicate an adverse health impact.”

^†VOC concentrations sustained at 0.5 ppm is an action level for field teams. An exceedance in this value does not mean health effects will occur and is not a health-based guideline but is a threshold to promote further investigation in the community.

^††Based on the US EPA National Ambient Air Quality Standard (NAAQS) criteria for pollutants and designed to protect public health with an adequate margin of safety.

^aThe qualifier “No” means air monitoring did not indicate readings above health-based screening levels.