Table 5.

Pearson’s R and Spearman’s Rho pairwise correlations between L_Aeq-1hr noise levels and measurements of airport activity, meteorology, or source specific particle number concentrations, where P ≤ 0.05.

Parameter		Horley			Poles Lane
Group	Type	Count	R	Rho	Count	R	Rho
Airport activity	Total flights (n)	2,058	0.51	0.49	1,964	0.52	0.52
	Easterly flights (n)	367	0.44	0.42	609	0.55	0.49
	Westerly flights (n)	1,368	0.34	0.27	1,037	0.32	0.29
Meteorology	Air temperature (°C)	2,026	0.30	0.38	2,022	0.29	0.28
	Precipitation (mm)	1,956	0.17	0.06	1,495	0.12	0.21
	Relative humidity (%)	2,026	−0.27	−0.33	2,022	−0.25	−0.27
	Wind speed (m s−1)	2,026	0.62	0.56	2,022	0.65	0.55
Primary PNC sources	Total PNC (p cm−3)	2,033	0.30	0.33	2,022	0.10	–
	Airport PNC (p cm−3)	2,033	0.42	0.52	2,023	0.18	0.17
	Fresh traffic PNC (p cm−3)	2,033	0.30	0.38	2,023	0.16	0.14
	Urban PNC (p cm−3)	2,033	−0.17	−0.24	2,023	−0.22	−0.31