Estonia – Zero Emission Zones

Is the driving factor for these zones either limiting noise, emissions (local air pollution) or have they historically been in place for a number of years?On lakes under 100ha and rivers narrower than 10m fuel engines are allowed only for governmental survey, resque or surveillance purposes https://www.riigiteataja.ee/akt/104072019005?dbNotReadOnly=trueAre there any incentives in place to encourage zero emissions and what type of technology is most prevalent?No major incentives introduced by the state