28日早晨，北京再次出现较严重的雾霾天气，多个监测站点空气质量达严重污染级别。上午，受上游沙尘天气和本地扬沙影响，京城刮起西北风，出现今年首次沙尘天气，雾霾则被驱散，天空颜色由灰白转为土黄。下午至晚上，北京仍然有5—7级大风，不过沙尘状况逐步好转。

28 in the morning,Beijing again heavy fog haze of the weather,Multiple level of air quality monitoring sites of serious pollution.In the morning,Affected by upstream and local flying sand dust weather,City northwest wind blowing,Appeared for the first time this year the dust weather,Fog was dispelled,The sky color from grey to yellow.Afternoon to the evening,There is still 5-7 class gale in Beijing,But dust conditions gradually improve.

　　北京市环保局28日10时监测数据显示，西部地区空气质量监测子站PM10的瞬时值接近1000微克/立方米，与前期受不利扩散影响的污染积累相叠加，整体污染情况非常严重。

Beijing municipal environmental protection bureau monitoring data showed that 28, 10,Son air quality monitoring stations in the western of PM10 instantaneous value is close to 1000 micrograms per cubic meter,With early affected by adverse diffusion contamination accumulation of superposition,The overall pollution situation is very serious.

“霾沙”概率小，一般发生在局部地区 "Haze of sand"Probability is small,Generally occurs in local areas

　　“既有雾霾，又有沙尘暴，太可怕了！”不少市民在全副武装的同时，也在担忧：“霾沙”天气会不会频繁发生？

"Both the fog haze,And dust storms,It's terrible!"Many people at the same time in the heavily armed,Also in fear:"Haze of sand"The weather is not frequent?

　　“‘霾沙’天气只是老百姓的通俗说法。”国家林业局防沙治沙办公室主任刘拓表示，雾霾和沙尘天气有可能同时发生，但一般发生在局部地区。比如，在发生沙尘暴或扬尘天气的过程中，会形成带尘埃的气溶胶，风力不强时，就会吸收空气中的水汽、二氧化硫、二氧化氮等，从而形成“霾沙”天气。

"‘Haze of sand’The weather just ordinary popular term."The state forestry administration said LiuTa, director of the office of sand prevention,Smog and dust weather are likely to occur at the same time,But generally occurs in local areas.Such as the,In the process of dust storms and dust weather,Will form a belt of dust aerosol,When the wind is not strong,Will absorb moisture in the air/Sulfur dioxide/No2, etc.,To form a"Haze of sand"The weather is.

　　“一定条件下，沙尘和雾霾会产生叠加现象，只是这种概率比较小。”北京林业大学水土保持学院教授张克斌说。

"Certain conditions,Dust and fog will produce superposition phenomenon,Only the probability is small."Professor of Beijing forestry university, institute of soil and water conservation Zhang Kebin said.

　　此次北京的“霾沙”天气发生在清晨之后的一段时间，到了上午10时左右，随着风速加大，就转为单纯的扬尘天气，持续的时间并不长。

The Beijing"Haze of sand"Weather occurred in the early morning after a period of time,At around 10 am,As wind speed increases,Into mere dust weather,Last time is not long.

　　“受天气和地表干旱的影响，今年我国沙尘天气会比往年有所增加，但还属于正常范围。” 刘拓说，相对而言，沙尘天气对我国北方地区的影响是长期的、频繁的，而雾霾天气发生的几率小、次数少、时间短。

"Affected by drought weather, and the surface,The dust weather this year than in previous years,But still belongs to the normal range." LiuTa said,In relative terms,Sand and dust weather in northern China region's influence is long-term/frequent,Little risk of fog and haze weather occurred/less/Time is short.

两会期间北京以晴到多云天气为主 During the two sessions in Beijing is given priority to with sunny to cloudy weather

　　张克斌表示，沙尘天气与雾霾天气产生的机理不同。沙尘暴或扬尘天气主要受大气环流影响，由大风将沙尘吹起、移动造成；而近期发生的雾霾天气，主要是低气压导致污染物无法扩散造成的。

Zhang Kebin said,The mechanism of sand and dust weather and fog haze weather is different.Dust storms or dust weather was mainly affected by atmospheric circulation,By the strong wind will be blowing sand and dust/Mobile cause;The recent fog haze weather,Mainly is caused by depression lead to pollutants can't spread.

　　此外，雾霾天气主要发生在城市地区，而沙尘天气覆盖沙尘经过的所有城市和乡村。

In addition,Fog haze weather occurs mainly in urban areas,And dust weather cover to pass all of the city and the country.

　　张克斌说，要防治雾霾和沙尘天气，更应该搞好植树造林，特别是种植吸附PM2.5效果突出的乔木。有观点认为，防沙治沙种植的大量乔、灌、草阻碍了风的通过，因此导致雾霾天气。他表示，“这些植被的最大高度不过几十米，对大气环流的影响极为有限，并不会造成污染物的积累。”

Zhang Kebin said,To prevention and control of smog and dust weather,Should do a good job in afforestation,Especially the adsorption effect of PM2.5 prominent tree planting.It is thought,We shall grow lots of Joe/To fill/Grass stymied by the wind,So cause haze weather.He said,"The maximum height of vegetation but dozens of meters,The impact on the atmospheric circulation is very limited,Will not cause the accumulation of pollutants."

　　另外，记者28日从中国气象局获悉，全国两会期间北京地区气温偏高，以晴到多云天气为主，降水偏少。其间，由于受弱冷空气影响，北京可能出现局部沙尘和大风的天气，而在冷空气活动间歇期间，有可能出现雾霾天气。中国气象局将做好两会气象保障服务。

In addition,28, reporters learned from the China meteorological administration,High temperatures across the country during the two sessions in Beijing area,Give priority to with sunny to cloudy weather,Precipitation less.meanwhile,Due to the effect of weak cold air,Beijing may appear local sand dust weather and high winds,And during the intermittent cold air activities,Likely the fog haze weather.The China meteorological administration will increase two meteorological security service.