WHO Night-Noise Reference
Return the WHO Europe night-noise guideline and interim-target context.
Description
Night-noise guidance uses defined averaging periods and measurement positions.
When to use WHO Night-Noise Reference
Use this tool to return the WHO Europe night-noise guideline and interim-target context.
Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.
How to use WHO Night-Noise Reference and understand its results
- Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.
- Enter topic using the field table and calculation rules, then run the tool.
- Read source, statement, topic. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| topic | Reference topic to return. | string; one of "guideline", "interim-target", "caution" | Required |
Choose an exact topic enum from the input table and run the lookup. The implementation selects a fixed local entry and returns source, statement and the selected topic. Matching is case-sensitive without trimming or free-text search.
result=stored entry for selected topic Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| source | Source used for the reference statement. | string |
| statement | Narrow reference statement for the selected topic. | string |
| topic | Selected reference topic. | string; one of "guideline", "interim-target", "caution" |
{
"input": {
"topic": "guideline"
},
"output": {
"source": "WHO Night Noise Guidelines for Europe (2009)",
"statement": "The 2009 WHO Night Noise Guidelines for Europe identify an annual outdoor Lnight guideline of 40 dB.",
"topic": "guideline"
}
}Limitations and assumptions
The table summarizes WHO Europe’s 2009 scope; no measurement, present local limit or health-risk assessment is provided. The source is a stored bibliographic label, not a fetched document; statements are not refreshed at runtime.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Space Noise Criteria Reference: Return room-noise criterion selection cautions for occupied spaces. For a complementary task, use Ordinance Hours Screen: Check a same-day activity interval against caller-supplied ordinance hours, with an explicit variance override; it embeds no jurisdictional schedule.
Further background: Night Noise Guidelines for Europe (2009).
References
-
WHO Night-Noise Reference — tool.io
-
Night Noise Guidelines for Europe (2009) — World Health Organization
Similar or alternative tools
- Space Noise Criteria Reference
Return room-noise criterion selection cautions for occupied spaces.
- Ordinance Hours Screen
Check a same-day activity interval against caller-supplied ordinance hours, with an explicit variance override; it embeds no jurisdictional schedule.