The climate in some areas in the west is different from that in other areas. The local precipitation is very scarce, coupled with low vegetation coverage and strong wind, so the density of pollen in the air is very high. The density of pollen transmission is also very strong, so this allergic phenomenon is very serious, which is very easy for locals who are allergic to pollen. Therefore, the relevant departments suggest that people who are allergic to pollen in these areas must be fully armed before going out, such as wearing masks, hats and glasses to keep their skin out of contact with some pollen in the air, that is, they must be strictly protected to avoid this phenomenon of pollen allergy.
In addition to the western region, the index of the central region is also relatively high, such as Henan, Anhui and Hubei. People in these areas are also very prone to allergies, so when spring comes, people who are allergic to pollen in these central areas had better reduce outdoor activities, and more importantly, try not to stay outdoors for a long time in the afternoon and sunny periods, because this is a very allergic period.
Of course, people who are allergic to pollen in some areas are very happy, because there are so few pollen floating in the air in some areas that they don't need to pay attention at all. For example, the eastern regions, such as Harbin, Changchun and Shenyang, do not need protection at all, while in Lhasa, people who are allergic to pollen can go out easily as usual.