# London Ambulance response times

> Mean and 90th-percentile response times for the most urgent Category 1 and Category 2 calls.

- Category: NHS
- Cadence: monthly
- Status: Published on a monthly cadence.
- Dataset key: `london-ambulance-response-times`
- Source: [NHS England](https://www.england.nhs.uk/statistics/statistical-work-areas/ambulance-quality-indicators/)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/london-ambulance-response-times](https://londongraph.com/g/london-ambulance-response-times)
- Machine-readable record: [https://londongraph.com/data/london-ambulance-response-times](https://londongraph.com/data/london-ambulance-response-times)

## Methodology

Accredited monthly AmbSYS indicators for London Ambulance Service NHS Trust (RRU), converted from seconds to minutes. Category 1 is immediately life-threatening; Category 2 is an emergency or potentially serious condition. Means and 90th percentiles describe different parts of the response-time distribution.

## Visualisations

- [Trend](https://londongraph.com/g/london-ambulance-response-times): Mean and 90th-percentile response times for the most urgent Category 1 and Category 2 calls.
- [Small multiples](https://londongraph.com/g/london-ambulance-response-times?view=small-multiples): Give each series its own aligned panel.
- [Change](https://londongraph.com/g/london-ambulance-response-times?view=change): Show the change from each preceding published period.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.