Outcome secures him a fifth presidential term.
President Rahmon will win easily, but elections are the least of his problems.
Tehran summoned the Tajik ambassador to account for accusations of supporting terrorism.
Iran, Kyrgyzstan and Tajikistan among countries ranked most vulnerable by inaugural edition of Ecological Threat Register.
Nevertheless, one analyst holds that the Kremlin “sees growing discontent” with dictator of three decades Emomali Rahmon and “probably understands that very soon he will be unable to prevent a social explosion”.