Effects of Air Pollution on Materials and Cultural Heritage: ICP Materials Celebrates 25 Years of Research

Table 2

Reported environmental data from ICP Materials test 1987–2009: X: mandatory; (X): optional; —: not reported.

Parameter	Symbol	Unit	1987–1995	1995–2001	2002-2003	2005–2009
Temperature	T	°C	X	X	X	X
Relative humidity	Rh	%	X	X	X	X
Time of wetness	Tow	h	X	—	—	—
Sunshine	Sun	h	X	—	—	—
Sunshine^a	Sun	MJ m^−2	X	X	X	—
SO2 concentration	SO2	μg m^−3	X	X	X	X
NO2 concentration	NO2	μg m^−3	X	X	X	X
O3 concentration	O3	μg m^−3	(X)	(X)	X	X
HNO3 concentration	HNO3	μg m^−3	—	(X)^b	(X)	X
Precipitation: amount	Prec	mm	X	X	X	X
(i) conductivity	Cond	μS cm^−1	X	X	X	(X)
(ii) pH	pH	—	X	X	X	X
(iii) SO4^2−, NO3^−, Cl^-	varies	mg L^−1	X	X	X	X
(iv) HN4^+, Na^+, Ca^2+, Mg^2+, K^+	varies	mg L^−1	(X)	(X)	(X)	(X)
Particulate matter	PM	μg cm^−2 month^−1	—	(X)^b	(X)	X

^aCalculated from sunshine hours and latitude.
^bOnly data at a few test sites reported.