Reference

`air.sensor_reading`

domain: air

A POINT air-quality observation from a physical sensor/station — raw, as ingested. Spatial addressing lives in the `space` block (a point, optionally the enclosing H3 cell); it is a point measure, not a cell measure. Valid-time is `observed_at`.

Field	Type	Required	Description
`schema`	`—`	✓
`id`	`string`	✓
`sensor_id`	`string`
`space`	`object`	✓	point:{lat,lon} + optional {h3,res} of the enclosing cell
`pm25`	`number`
`no2`	`number`
`o3`	`number`
`observed_at`	`string`	✓	ISO8601 observation time (valid-time)
`source`	`string`