我认为长沙的空气污染问题有一点点严重，与去年相比空气优良天数少了大约二

I think that the problem of air pollution in Changsha have a little severe, compared with last year air quality days less for about twenty days the main source of pollution is O3,1 ~ October, the quality of urban air quality days a total of 234 days, air quality, excellent rate 77.0%, PM2.5 concentration and NO2 concentrations were increased to varying degrees, on the whole worse than last year

I think Changsha's air pollution problem is a little bit serious, compared with last year, air good days less about 20 days, the main source of pollution is O3, January to October, urban air quality days accumulated 234 days, air quality excellent rate of 77.0%, PM2.5 concentrationand and NO2 concentrations both increased to varying degrees, overall worse than last year

I think the problem of air pollution in Changsha is a little serious. Compared with last year, the number of days of good air quality is about 20 days less. The main source of pollution is O3. From January to October, the number of days of good air quality in urban areas has accumulated 234 days. The rate of good air quality is 77.0%. The concentration of PM2.5 and NO2 are rising in different degrees. Generally speaking, it is worse than last year<br>