LOINCActiveObservation

LOINC Code 105356-0: Number of days having an air quality index value (AQI)

105356-0 is a LOINC code used to identify Number of days having an air quality index value (AQI) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Number of days having an air quality index value (AQI). It is commonly used with the system or sample type ^Patient.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Number of days having an air quality index value (AQI). It is commonly used with the system or sample type ^Patient.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Observation

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Number of days having an air quality index value (AQI)
  • # Days with AQI - Number of days in the year having an Air Quality Index value. This is the number of days on which measurements from any monitoring site in the county or MSA were reported to the Air Quality System (AQS) database.
  • No; Num; Num days with AQI; PhenX; Point in time; QNT; Quan; Quant; Quantitative; Random

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Number of days having an air quality index value (AQI)Num Days with AQIPHENXTimePt^PatientQn

Frequently asked questions

Code details

Code105356-0
SystemLOINC
Display nameNumber of days having an air quality index value (AQI)
Short nameNum Days with AQI
ComponentNumber of days having an air quality index value (AQI)
PropertyTime
TimingPt
System (specimen)^Patient
ScaleQn
ClassPHENX
Example unitsdays
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.78
Last changed2.78

Part names

Number of days having an air quality index value (AQI)TimePt^PatientQnTime (e.g. seconds)Point in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.