Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Lichen carbon [(a) and (b)], nitrogen [(c) and (d)] and sulfur contents [(e) and (f)] (wt%) in X. parietina and Physcia spp. colour-coded (low to high) across Manchester; displayed with automated air quality monitoring stations and major road network (A- and B-roads and motorway); and SVM interpolated values (same colouring and range) including Manchester’s urban factors
