In order to study the impact of fireworks and firecrackers on PM

2.5

in Nanchang city

the trend of PM

2.5

mass concentration in Nanchang city was analyzed from March 2nd to 5th

2018

and the mass spectrometric characteristics of fireworks and firecrackers by using single particle aerosol time-of-flight mass spectrometer was used to were evaluate the proportion of fireworks and firecrackers in PM

2.5

before and after the Lantern Festival. The results showed that the increase of PM

2.5

mass concentration from the night of March 2nd to the early morning of M

arch 3rd may be related to the fireworks and firecrackers; the fireworks and firecracker source particles account for 11.5% of all the particles

and the daily average was 13.7% on March 3 which was the highest; in the characteristic ions of fireworks

the concentration of Al+increased by about 4.4 times

the concentration of Ba+increased by about 16.9 times

the concentration of Mg+ increased by about 3.9 times

and the concentration of K

2

Cl

+

increased by about 24.4 times.