Syrian government forces carried out 214 chemical attacks since 2011, according to a Syrian watchdog.
In a statement on Wednesday, the Syrian Network for Human Rights (SNHR) said these attacks have claimed the lives of at least 1,421 people.
A total of 187 children and 244 women were among the victims, the NGO said.
The report was released on the first anniversary of a chemical attack in the town of Khan Sheikhoun in the northwestern Idlib province last year, in which over 100 people were killed and hundreds injured.
A fact-finding mission by the UN’s chemical watchdog, the OPCW, following the attack had concluded that sarin or a sarin-like substance was used as a chemical weapon in the April 4 attack in the Syrian town of Khan Sheikhoun.
According to the NGO, the Syrian regime has carried out 11 chemical attacks since the Khan Sheikhoun attack.
Last year, a UN investigation panel has concluded that Syrian army forces were responsible for the sarin gas attack in Khan Sheikhoun.
Syria has been locked in a devastating civil war since March 2011.
UN officials say hundreds of thousands of people have been killed in the conflict.