Punishments meted out for such offences will become a third more severe than they are currently.
Copenhagen Police announced the rule change in a statement in connection with a firework safety campaign, Ritzau reports.
People who intentionally endanger others using fireworks can, under current laws, be punished with between 10 and 60 days in prison.
If a public servant like a police officer is targeted, the culprit can face between four and nine months in jail.
Both types of offence will now be subject to stronger sentences.
“The new, sharper punishment underlines that there can be serious legal consequences if you set off fireworks at others,” Copenhagen Police director Anne Tønnes said in the statement.
Lars Weiss, the lord mayor of the Danish capital, said the majority of residents act responsibly when it comes to fireworks.
“But last year, we unfortunately saw that some people were incapable (of being sensible) and were therefore a danger to their surroundings,” Weiss said in the statement.
Denmark restricts the sale of fireworks so they can be purchased from December 15th until New Year's Eve and set off from December 27th.