{
  "synthetic": true,
  "format": "Generic teaching format, version 1; not a manufacturer export",
  "gas": "Hydrogen sulfide (H2S)",
  "unit": "ppm",
  "timezone": "UTC",
  "planned_window_start": "2026-01-15T09:00:00+00:00",
  "planned_window_end": "2026-01-15T09:20:00+00:00",
  "numeric_field_definition": "Mean for the entire half-open one-minute interval [start,end), accepted as valid within this teaching exercise. No concentration curve is supplied.",
  "missing_field_definition": "No measurement value supplied for this interval. The cause is unknown. Not zero.",
  "event_definition": "Independent event summary. Duration is recorded alarm-event duration, not proof of total exposure duration. Peak is a reported event maximum, not the unknown true atmospheric maximum.",
  "unknown_real_instrument_fields": [
    "internal sampling frequency",
    "sensor response",
    "detection/reporting thresholds",
    "actual firmware",
    "actual calculation algorithm",
    "actual person and location"
  ],
  "exercise_date_is_fictional": true
}