Table 3.

Spearman correlation coefficients between daily average Ambrosia pollen concentrations recorded in Rzeszów. Kraków and Poznań in three periods during 1997–2009: (1) 1 August–30 September [VIII–IX]; (2) 1 August–15 October [VIII–15.X]; (3) 1 August–31 October [VIII–X];

Year	Rzeszów-Kraków			Kraków-Poznań			Rzeszów-Poznań
	VIII-IX	VIII-15.X	VIII-X	VIII-IX	VIII-15.X	VIII-X	VIII-IX	VIII-15.X	VIII-X
1997	0.278*	0.290**	0.279*	0.243*	0.281**	NS	0.431***	0.424***	0.435***
1998	0.384***	0.409***	0.335**	0.542***	0.544***	0.537***	0.428***	0.441***	0.396**
1999	0.427***	0.433***	0.437***	0.580***	0.583***	0.593***	0.484***	0.495***	0.501***
2000	0.317**	0.344***	0.364**	NS	NS	NS	NS	NS	NS
2001	0.347**	0.436***	0.302*	0.314**	0.362***	0.340**	NS	0.211*	NS
2002	0.709***	0.715***	0.699***	0.608***	0.622***	0.582***	0.587***	0.602***	0.573***
2003	0.348**	0.415***	NS	0.248*	0.270**	NS	NS	NS	NS
2004	0.498***	0.495***	0.512***	NS	NS	NS	NS	NS	NS
2005	0.450***	0.519***	0.371**	0.237*	0.321**	NS	0.642***	0.669***	0.594***
2006	NS	NS	NS	0.382***	0.415***	0.317*	NS	NS	NS
2007				NS	0.214*	NS
2008				0.447***	0.469***	0.412***
2009	0.314**	0.362***	NS	0.388***	0.419***	0.337**	0.271*	0.315**	NS
1997–2009	0.303***	0.340***	0.305***	0.324***	0.308***	0.296***	0.287***	0.349***	0.295***

*P < 0.05 **P < 0.01 ***P < 0.001, NS Non-significant