{
"start": "2022-08-01",
"end": "2026-09-17",
"fetched": "2026-09-18",
"source": "Open-Meteo Air Quality API (CAMS)",
"attribution": "Open-Meteo.com, from Copernicus Atmosphere Monitoring Service",
"note": "Hourly PM2.5 from a continental model on a coarse grid, reduced here to a daily mean per point and then to a per-month record across every year fetched. A model cell is tens of kilometres wide and a Mae Hong Son valley is not; treat these as the shape of the season, not as a reading taken where you are standing.",
"point_days": 15050,
"model_ceiling": 99.4,
"days_over_125": 0,
"points": [
{
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"name": "Chiang Mai",
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