Highlights of other activities

The other activities refer to Pirelli Ambiente (which also include the activities related to particulate filter figures) and PZero and are broken down as follows

(in milions of euro)
  Pirelli Ambiente  PZero  Total other business
2013 2012 2013 2012 2013 2012 
Net sales 22.3  29.2  8.1  11.0  30.4  40.2 
Gross operating profit before restructuring expenses (11.8)  (6.9)  (13.1)  (16.7)  (24.9)  (23.6) 
Operating income before restructuring expenses (14.9)  (10.7)  (14.0)  (17.6)  (28.9)  (28.3) 
Restructuring expenses (1.0)  - (1.1)  - (2.1)  -
Operating income (15.9)  (10.7)  (15.1)  (17.6)  (31.0)  (28.3) 

At December 31, 2013 net sales totalled euro 30.4 million, compared with euro 40.2 million at December 31, 2012, while the operating loss was euro 31.0 million (due to euro 2.1 million in restructuring charges), compared with the euro 28.3 million operating loss in 2012.

The reduction in filter activities, which partly reflected the strategy of focusing on the Tyre business, specifically led to impairment of assets and inventories by about euro 7 million.