AURN Monitoring Site

London Westminster (HORS, an AURN site)

Latitude: 51.494670
Longitude: -0.131931
Date Started: 17/07/2001
Altitude: 5 metres
Environment: Urban Background

Latest Data

This monitoring site data was last updated: 24/07/2019 08:00

Parameter Pollution Band Concentration Period
PM2.5 particulate matter (Hourly measured) Low (Index 2) 16 µg/m3 (BAM) 24 Hour mean
Nitrogen dioxide (NO2) Low (Index 1) 21 µg/m3 hourly mean
Nitric oxide (NO) not applicable 2 µg/m3 hourly mean
Nitrogen oxides as nitrogen dioxide (NOx as NO2) not applicable 24 µg/m3 hourly mean

Note: Values are based on provisional data. Data are GMT hour ending.
PM10 is measured as a running 24 hour mean, up to the current hour, and the band/index is calculated accordingly.

Map showing the location of the London Westminster monitoring site