Changsha air quality

By the end of June, 2023, 65438+1October, 65438+June, the concentration of PM2.5 in Changsha had dropped to 35 μ g/m3, the number of excellent days had increased by 15 days, and the comprehensive index was 3.4, an improvement of 4.2%.

Since 2023, Changsha has been fighting for the blue sky with fighting thinking, reducing concentration, ensuring Excellence. With the general recovery of air quality in the province, air quality continues to improve. In September this year, the air quality in Changsha was 100%, and the concentration of PM2.5 was 19 μ g/m3, which was the best in the same period in history.

At present, Changsha has entered a period of special concern for air pollution prevention and control in autumn and winter (June 2023 10 to March 2024 15). Changsha will focus on ten special rectification actions, including supervision assistance and law enforcement inspection of key gas-related enterprises, dust pollution from muck, dust pollution from roads and dust pollution from construction sites, to effectively improve air quality.

The climate of Changsha:

Changsha belongs to subtropical monsoon climate, which is characterized by mild climate, abundant precipitation, simultaneous rain and heat, and distinct four seasons. The annual average temperature in Changsha is 17.2℃, the annual accumulated temperature in each county is 5457℃, the annual average precipitation in urban area is 136 1.6 mm, and the annual average precipitation in each county is 1358.6-65438.

Changsha is long in summer and short in spring and autumn, with about 1 18- 127 days in summer, 1 17- 122 days in winter and 6 1-64 days in spring. The temperature changes greatly in spring, with more rain in early summer, long high temperature in summer and autumn and less cold in winter. From late March to mid-May, cold and warm air crossed each other, forming continuous rainy and low temperature weather.

Since the end of May, the temperature has obviously increased. In summer, the average daily temperature is above 30℃ for 85 days, and in hot days above 35℃, the average annual temperature is about 30 days, and it is very hot and rainy in summer. After the end of September, it is warmer during the day and cooler at night, with less precipitation and more low clouds.

165438+ 1 from late October to mid-March of the following year, the severe cold period in Changsha is very short, and1is the coldest in June, with a monthly average of 4.4℃-5. 1℃. Overwintering crops can safely overwinter and grow slowly.

Reference to the above content: Baidu Encyclopedia-Changsha City