Air Quality Observations – Adjacent Row Changes

Choose this endpoint when you have a local batch of timestamped air quality observations and need fast, inexpensive period-over-period change calculations without external data enrichment or forecasting. Ideal for auditing sensor logs, spotting consecutive reading anomalies, or generating a simple delta report before further analysis. Not suitable when you need forecast data, cross-dataset enrichment, or more than 200 records processed at once.

• Fewer than 1 row supplied — minItems validation failure
• More than 200 rows supplied — maxItems validation failure
• Missing required fields (row_id, station, date, pm25, humidity_percent) — schema validation error
• Invalid date format (not YYYY-MM-DD) — pattern validation error
• Invalid field enum value (not 'pm25' or 'humidity_percent') — enum validation error
• Null numeric values in the selected field — may produce null/undefined delta for affected rows
• Payment failure — x402 protocol payment not completed