Higher excise duties on petroleum products and higher tax on the pollution of air with carbon dioxide emissions (CO 2 tax) led to the difference between the indices; the HICP was higher than the HICP-CT in the groups housing, water, electricity, gas and other (by 0.1 p.p.) and transport (by 0.3 p.p.).
Poleg višjih trošarin za naftne derivate so se zvišale tudi okoljske dajatve za onesnaževanje zraka z izpusti (CO 2 ), kar je povzročilo razliko med indeksoma; HICŽP je bil višji od HICŽP-CT v skupinah stanovanje in prevoz (za 0,1 oz. 0,3 odstotne točke).