Air4Thai official station observations →
Operator: Pollution Control Department (PCD)
Reuse terms: Public source; no open reuse license verified. Follow the operator's terms.
Chiang Mai air quality: reviewed PCD stations
Inspect the official source links and interpretation limits for this reference. Source observations and downloads are unavailable until the required permissions are verified.
Reference facts
| Field | Value |
|---|---|
| Reference reviewed |
Dated station readings
Read the observation time before using a value. Evaluation or retrieval time does not make an old reading current. This bounded response is not a complete historical archive, forecast or warning service.
Evidence evaluated:
Readings are unavailable in this response. Use the official source links below to check the upstream record. No missing value is treated as zero or as evidence of safe conditions.
Coverage, history and interpretation limits
- Only the two named PCD stations are included. They do not represent every neighbourhood or a citywide average; missing observations are unknown.
- PM2.5 is a concentration in µg/m³, distinct from the dimensionless Thai PCD AQI. The live source reports rolling 24-hour particle means; the archive contains daily means.
- The downloadable archive covers 2024, not current conditions. Coordinates were joined to the 1 October 2026 official catalogue; historic station relocation is unverified. Missing cells stay null.
- Live readings are stale after 3 hours and unknown after 24 hours. If the official endpoint cannot be reached, use the official viewer and treat this page's live values as unavailable.
Official sources and reuse terms
PCD 2024 daily PM2.5 archive →
Operator: Pollution Control Department (PCD)
Reuse terms: Open Data Common (as labelled by PCD archive). Live catalogue terms are separate.
Continue with related evidence
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