Table 6.

Pollution, pollen and weather measurement: median correlations both within single postcode regions (bold), and across the whole UK ($†$).

Measurement	Region count (regions with $\ge$2 sensors)		Median corr
NO2_mean	44	Median	0.689
		UK (all regions)	0.531$†$
NOXasNO2_mean	44	Median	0.63
		UK (all regions)	0.482$†$
O3_mean	12	Median	0.892
		UK (all regions)	0.665$†$
PM10_mean	28	Median	0.853
		UK (all regions)	0.678$†$
PM2.5_mean	20	Median	0.948
		UK (all regions)	0.73$†$
Pressure_mean	28	Median	0.998
		UK (all regions)	0.939$†$
Relativehumidity_mean	67	Median	0.85
		UK (all regions)	0.461$†$
SO2_mean	5	Median	0.219
		UK (all regions)	0.146$†$
Temperature_mean	67	Median	0.985
		UK (all regions)	0.922$†$
Alder (Alnus spp.)	0	UK (all regions)	0.281$†$
Ragweed (Ambrosia spp.)	0	UK (all regions)	0.099$†$
Mugwort (Artemisia spp.)	0	UK (all regions)	0.153$†$
Birch (Betula spp.)	0	UK (all regions)	0.219$†$
Hazel (Corylus spp.)	0	UK (all regions)	0.093$†$
Ash (Fraxinus spp.)	0	UK (all regions)	0.167$†$
Plane (Platanus spp.)	0	UK (all regions)	0.199$†$
Grass (Poaceae)	0	UK (all regions)	0.302$†$
Oak (Quercus spp.)	0	UK (all regions)	0.162$†$
Willow (Salix spp.)	0	UK (all regions)	0.166$†$
Elm (Ulmus spp.)	0	UK (all regions)	0.134$†$
Nettle family (Urticaceae)	0	UK (all regions)	0.212$†$

Data for March–September, inclusive, is used. Only significant correlations (those with p$\le$0.05) are reported here.