In this experiment, rats were exposed to black gunpowder smog to mimic inhalation lung injury. The researchers tested the effects of combining puerarin and edaravone in treating this type of lung injury in rats. They compared different treatments by measuring oxygen and carbon dioxide levels in the blood, as well as levels of inflammatory markers in the blood and lung tissues. The results showed that the combination treatment (puerarin with edaravone) led to better outcomes compared to individual treatments. Rats receiving the combination therapy had improved oxygen levels in the blood, lower inflammation markers, and healthier lung tissue compared to those receiving only puerarin or edaravone. This suggests that the combined use of puerarin and edaravone could be beneficial in protecting against lung injury caused by inhaling black gunpowder smog.