关于雾霾天气的作文

This spring,many cities in China suffered haze weather.As we can see/As can be seen,whenever haze happens,the sky is grey,the visibility is declining,and the air quality is worsening,What causes haze weather is that the air close to the earth is quite wet,the wind speed is slow as well as various pullutants accumulate in the air.It's reported that haze contains a lot of poisonous matters,which will do great harm to our lungs.According to experts,we should avoid outdoors activities,stay away from the crowd,and we should go to the countryside to breathe more fresh air in our spare time at weekends.