[Real time] Will you wear a mask tomorrow? Look at the forecast first or online this year

The 2016 annual briefing on the prevention and control of air pollution was held yesterday. It is understood that the number of urban hustle and bustle days last year was 54 days, a decrease of 24 days compared with the previous year; the number of air quality days in the urban area (excluding the Dongtou District) was 333 days, maintaining a continuous improvement trend. It is reported that the city is expected to achieve tomorrow morning AQI (air quality index) forecast.

Wenzhou area has multiple occurrences in January, March and December.

In 2016, the average number of days in the city of Wenzhou was 29.2 days, a decrease of 32% (14 days) from the previous year. The number of days in the urban area of ​​Wenzhou in 2016 was 54 days, a decrease of 24 days from the previous year. Wenzhou City, Yongjia, and Ruian are rampant sites, and January, March, and December are rampant periods.

In 2016, the city’s hazy weather was mainly affected by minor impacts. There was only one moderate haze effect in the whole year, and no heavy or severe hail effect was observed. Compared with 2015, the increase in precipitation, increase in relative humidity, and increase in average wind speed are the main reasons for the decrease in the following day.

In 2016, the city (excluding Dongtou District) had a total of 333 days of good air quality. After Lishui and Zhoushan, it ranks third in the province. Other counties (cities, districts) all reached over 94%, of which Taishun County and Wencheng County were 99.4% and 99.1%, respectively; Dongtou, Yongjia, Pingyang, Cangnan, and Shui'an were all 96.8%. It is understood that this is the first time that the excellent rate has reached more than 90% since our city implemented the air quality evaluation system in 2013.

Decrease in PM2.5 concentration

In 2016, the concentration of PM2.5 in our city has decreased, but it is still the key pollution factor in the city's primary air pollutants. From the regional analysis, the mean concentration of PM2.5 is low in the north and south, and the middle high phenomenon. The concentration of PM2.5 in Taishun, Wencheng, Dongtou and Yongjia is relatively low, and the third old district is relatively high, with Yueqing, Ruian and Cangnan PM2. 5 concentration is between the two.

From the analysis of the time trend, the concentration of PM2.5 in the air in Wenzhou City has obvious seasonal variation characteristics. Specifically, PM2.5 concentration was the highest from January to March, and the number of days that exceeded the standard was also the most, followed by 10 to 12 months, and July to September. The lowest, showing the characteristics of V-type, according to the actual season statistics, the results for the highest in winter, followed by spring and autumn, the lowest in summer.

In 2016, the annual average concentration of PM2.5 in 11 counties (cities, districts) in our city decreased by 60% year-on-year to 10% and above, of which Pingyang County had the largest decline, accounting for 18.4%, followed by Longwan District (14.0%). .

Air quality improvement related to winter warming

Meteorological factors are also external factors that determine atmospheric pollution. Since 2013, Wenzhou’s air quality and haze have continued to improve.

This has a certain relationship with warming in autumn and winter. Warming in autumn and winter means that the cold air in the north has weakened, and the southern warm air mass has become stronger. Then, the location of pollutants brought by the cold air in the north will be northerly, and the impact on Wenzhou will be smaller.

In addition, the southern warm humid air mass becomes stronger and the water vapor increases, which means that more precipitation will dilute pollutants. In November and December of last year, precipitation in northern Zhejiang continued to dilute pollutants imported into the north.

Citizens will get tomorrow's air quality forecast information

"Wenzhou City's Atmospheric (Heavy) Pollution Forecasting and Early Warning System" passed the professional team's research and development in the past three years and passed the acceptance by the expert group at the end of 2016. Currently, it has been put into use by the meteorological and environmental protection departments of the city. Last year, the environmental protection and meteorological departments jointly conducted the mid-college and national day forecast services.

It is worth looking forward to that in the first half of 2017, the forecasting and early warning system will be gradually rolled out on the website, Weibo, and WeChat public numbers. In the near future, citizens may also be able to use various kinds of mobile apps while viewing weather forecasts. Weather software to get the next day's air quality index in order to better arrange daily travel.