Will the cost of reducing NOx and SOx lower than today?

Yes, by up to 10 times. ENTEC and NERA provide the average abatement costs in EU per industrial sector and for shipping respectively. Within a credit-based system, installations with activities such as combustion in boilers, petroleum refineries power and district heat plants (NOx) and combustion in boilers, petroleum refineries power and district heat plants, cement and lime production (SOx) can see considerable savings per ton reduced.