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44 Finnair Group EN20 NO, SO and other significant air emissions by type and weight The field of business has NO emissions, but no significant SO emissions. The NO emissions are specified in item EN16. VOC emissions In Finnair Technical Services, volatile organic compound (VOC) emissions have been reduced significantly, by around 40 per cent, in 2008. The most significant factor was the switch to a more environmentally friendly paint removal chemical. The ending of heavy overhauls of wide-bodied aircraft and thereby the cessation of major painting and paint removal work also reduced emissions. Increased washing of jet engines, on the other hand, increased slightly VOC emissions arising from cleaning agents, but the performance values of the engines improve due to the washings and thereby the washings reduce fuel consumption and emissions. VOC emissions trend in Finnair Technical Services Aerial solvent emissions/kg paints paint removers glues solvents anti-corrosion agents amount, kg cleaning agents cleaning petrol trichloroethylene other halog. hyd. 70,000 60,000 50,000 40,000 30,000 20,000 year 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 EN21 Total water discharge by quality and destination All wastewaters produced by Finnair are discharged into the municipal sewerage network. The exception is a water-glycol mixture (propylene glycol) used in aircraft deicing, which in small amounts ends up in small streams and ditches along with melt waters. Glycol is a relatively harmless substance in the soil and waterways due to its rapid biological breakdown and low toxicity. On entry into waterways, its adverse effect can be considered to be the high oxygen consumption of its breakdown as well as the unwelcome odour resulting from this. The area's streams and ditches run into the River Kerava and River Vantaa. The effects of waters derived from the airport are not generally apparent in the main branch of the River Vantaa. In the River Kerava the effects are evident now and then as locally elevated nitrogen concentrations, which may possible originate from the airport area. Finavia reports on the glycol and the amounts thereof that end up in the soil and waterways in connection with aircraft de-icing.
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