I can get real time air quality index above ground on multitude of places. The most up-to date information on the tube I could found was this report[0], that o

I can get real time air quality index above ground on multitude of places. The most up-to date information on the tube I could found was this report[0], that only covered a number of stations. Even then, the information provided is not great, e.g. for Highbury & Islington: > The results for particulate matter were between <0.02 and 2.16 mg/m3 for PM2.5. Results cover the range from 4x of WHO recommended limit (5 μg/m3, i.e. 0.005 mg/m3) to 432x. [0] https://content.tfl.gov.uk/dust-monitoring-lu-stations.pdf https://content.tfl.gov.uk/dust-monitoring-lu-stations.pdf