Description
Subtract a supplied indoor-air background reading from an observation.
Environmental-health records connect sampled matrices, background references, observed areas, service dates and contact durations. An areal loading differs from a bulk or airborne concentration, and a censored result label differs from a quantified value. These summaries do not establish safe conditions or individual health risk.
Subtract a supplied indoor-air background reading from an observation.
When to use this tool
Use Indoor Air Background Subtraction when checking the stated environmental-health record, measurement basis or time convention.
How to use the tool and how it works
- Enter indoorConcentration, backgroundConcentration. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read backgroundRelativeConcentration. Use the output convention below.
Return indoorConcentration-backgroundConcentration as signed backgroundRelativeConcentration.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| indoorConcentration | Indoor Concentration | Required. Finite number. |
| backgroundConcentration | Background Concentration | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| backgroundRelativeConcentration | Background Relative Concentration | Required. Finite number. |
{
"input": {
"indoorConcentration": 25,
"backgroundConcentration": 10
},
"output": {
"backgroundRelativeConcentration": 15
}
}Limitations and assumptions
- Use compatible pollutant, concentration and sampling bases; a negative difference is retained and does not establish indoor-air safety or health risk.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified sampling and analytical records with qualified environmental-health professionals for actual exposure, remediation, water-quality or care decisions.
References
Similar or alternative tools
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- Indoor Air Change Exponential Removal Term Tool
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