Table 5. Environmental variables obtained for air sampling locations and dates and the sources they were obtained from.

Environmental variables ascertained for sampling date and location	Source of information
Maximum daily temperature at sampling location on sampling date (°C)	Met Office HadUK-Grid dataset (42)
Land cover classification of sampling location (21 categories)	UKCEH Land Cover Map 2019 (43)
Distance of sampling location to nearest composter with OW/OA (m)	Composter locations obtained from Environment Agency, Scottish Environment Agency (SEPA) website (44), Natural Resources Wales website (45), and Northern Ireland Environment Agency website (46). Distances were calculated using package “geosphere” in R version 4.0.0.