Why is the air quality in Qingdao slightly polluted?

I have never been to Qingdao, but I study air pollution. Now let me analyze my knowledge for you:

First of all, it must be clear that air pollution is closely related to meteorological conditions. Qingdao is located in the coastal area. Due to the influence of sea breeze, pollutants can be removed by transportation, and sea breeze will greatly reduce the concentration of pollutants in cities. Therefore, compared with other cities in Shandong, the air quality is still good.

However, due to economic development, emissions have increased (new factories, residents' lives, automobile exhaust, construction, etc. ), making the local air quality decline; More importantly, due to the influence of regional transportation, the regional pollution problem in North China is more prominent, and pollutants in heavily polluted areas can be transported to far places with the airflow. Take Shandong Province as an example, Zibo, Dongying and Liaocheng. They are all heavily polluted cities, which will inevitably have an impact on Qingdao's air quality under certain meteorological conditions.

In addition, due to the increase of motor vehicles, the emission of nitrogen oxides has increased, and a new type of pollution has gradually begun to appear-photochemical pollution. The direct impact of this pollution is atmospheric turbidity and excessive ozone, which is harmful to human health. It appears in developed areas such as Beijing, Shanghai and Guangzhou. In the case of light wind or no wind, pollutants will gradually accumulate to form pollution, and Qingdao will have a similar situation.

Finally, due to the high humidity in Qingdao, it provides conditions for gas phase and liquid phase chemistry. High humidity is more conducive to the condensation and growth of particulate matter, resulting in a direct consequence-poor visibility.

Add a point (it may be difficult to understand, so please consult the literature). As a special pollutant, ozone is characterized by being generated during the day and being eliminated by reacting with nitrogen oxides at night. However, due to the existence of land breeze and sea breeze, the land breeze at night blew the ozone of the city to the sea surface to be "preserved", and the sea breeze the next day blew the pollutants back from the sea surface and remained in the air, resulting in the continuous accumulation of pollution. This phenomenon exists in coastal areas of Taiwan Province Province, Pearl River Delta and other areas, and Qingdao may also exist, but to different degrees.