What are the environmental protection uses of hawthorn trees?

Hawthorn is very resistant to harmful gases. According to the investigation in Shenyang, it has strong resistance to harmful smoke in the northeast factory. The artificial fumigation test shows that it has strong resistance to sulfur dioxide and hydrogen fluoride and medium resistance to chlorine. According to the investigation in Beijing, there is no victim symptom at a distance of1500m from the sulfur dioxide pollution source.

The ability to absorb sulfur dioxide is very strong. According to Beijing's analysis, the sulfur content in leaves (in August) can reach 0.75% at a distance of1500m from the pollution source, which is 50 times that of the control area.