Reports here and here backs up those assertions and cite concerns over air pollution as being one of the key factors.
Such reports demonstrate a growing awareness of environmental issues in Shanghai, where air pollution has recently been a very topical issue.
Due to the heavy smog that plagued Shanghai and many cities in China's eastern and northern regions, local citizens have cut down on fireworks during this year's Spring Festival - about half of the usual amount.
By analysing data from the U.S. Consulate Shanghai Air Quality Monitor we have been able to answer this question.
The graph below shows how PM2.5 readings varied in the hours either side of the new year's midnight extravaganza.
From this we can see that readings from the Air Quality monitor peaked at 1am with an AQI of over 500 - which is quite literally off the scale!
Air pollution continued to be "hazardous" for a further two hours before returning to more "normal" levels.
The data demonstrates a clear correlation between the launching of fireworks and air pollution, though it is hard to say how quickly the effects dissipate.
Fireworks have been an important part of Chinese culture since they were invented in the 7th century and witnessing the Chinese New Year celebrations is a sight not to be missed.
However, people with respiratory conditions, the elderly and children might want to consider taking precautions such as staying insider or wearing a respirator.