China News Network, Chengdu, May 7th (Reporter Zhang Lang) The reporter learned from the Chengdu Municipal Bureau of Ecology and Environment on the 7th that from April 25th, due to the continuous high temperature and strong radiation weather, ozone pollution occurred in the Sichuan Basin and gradually on the 26th Regional pollution has formed, with varying degrees of pollution in the Chengdu Plain, southern Sichuan and northeastern Sichuan. As of May 6, Chengdu has experienced a total of 9 consecutive days of pollution. Affected by the weak cold air, the current round of pollution in Chengdu ended on May 7.
This round of pollution process is the first long-term regional ozone pollution process in the province this year. It has two typical characteristics: long pollution duration, wide range, heavy degree, strong atmospheric oxidation, and ozone and particulate compound pollution . Regional high temperature and strong radiation weather is an important objective reason, and the continuous increase of local pollutant emissions is a subjective factor.
According to reports, in terms of objective reasons, the Sichuan Basin also experienced the first round of high-temperature weather with a long duration since this year. Most cities have daily maximum temperatures above 30 ° C. Chengdu released its first since May this year. A high temperature orange warning, the daily maximum temperature exceeds 35 ℃, the earliest high temperature in history. Under the meteorological conditions of high temperature, strong radiation, and low humidity, it is very conducive to the formation of photochemical reactions, resulting in a rapid increase in ozone concentration; with the resumption of production and gradual transition to stable and full production, the level of social activities is accelerated to recover, and the total amount of pollutant emissions Continue to increase.
In terms of subjective factors, with the gradual transition from resumption of production to stable production to full production, the level of social activities has accelerated and the total amount of pollutant emissions has continued to increase. During this pollution process, the Key Laboratory of Atmospheric Research observed that during the night to early morning hours, the concentrations of nitric oxide, nitrogen dioxide, and volatile organic compounds increased simultaneously to varying degrees, with peak concentrations reaching 125 μg / m? , 162μg / m? And 254μg / m ?, especially the increase in the components of volatile organic compounds such as low-carbon alkanes and benzene series, which is particularly significant due to the emission of mobile sources.
According to the results of the Chengdu Eco-Environmental and Meteorological Departments: May 7th, Chengdu was affected by weak cold air, accompanied by temperature and precipitation, the current round of pollution process ended; on the 8th, the precipitation has weakened and the wind speed has decreased; on the 9th With showers changing to cloudy weather, the air quality in Chengdu is expected to be excellent or good on May 7-9. (Finish)