The air pollution level can be assessed using air quality index - AQI calculated from the concentration of some gases and particle matters which are measured at ambient air quality monitoring stations. The calculated AQI values are characterized by temporal continuity but spatial discontinuity. However, AQI values of each monitoring station is interpolated by the IDW (Inverse Distance Weighting) method in GIS which helps us to assess the air quality at a detailed and specific level for every location in the study area by establishing distribution maps of air pollution. The interpolation of AQI values for zoning air quality in several urban districts of Hanoi during the Winter (October, November, December 2019) shows that in general, the areas with a very bad level of air quality occupied an important surface in the Northwest of urban districts (on the territory of Bac Tu Liem, Ba Dinh, Tay Ho, Cau Giay) for last 3 months of the year. The areas with a bad level of air quality occupied a large surface in the Southeast in October and December, but its surface became narrow in November. But in November, areas having a bad level of air quality were expanded to the Southeast while they occupied only a small surface at the center of the study area in October and December. Although the distribution of each level vary in terms of coverage, their common pattern has been conserved during three months of Winter. The distribution map of air quality provides the complete picture of the air pollution situation and it helps to adequately evaluate this issue in the urban districts of Hanoi city.
Tỷ lệ lợn con mắc và chết do hội chứng tiêu chảy khá cao (30,17%). Giai đoạn 22 - 35 ngày tuổi tỷ lệ nhiễm cao nhất ( 35,29%). Tỷ lệ nhiễm bệnh giảm dần theo độ tuổi và xảy ra cao nhất khi cai sữa ở 42 ngày tuổi (36,56%). Triệu chứng thường thấy: Phân loãng, tanh khắm, trắng, vàng; Niêm mạc nhợt nhạt, khô; Mệt mỏi, ủ rũ lười vận động. Với bệnh tích đại thể và vi thể đặc trưng: Ruột non đầy hơi, xuất huyết và sung huyết ở màng treo ruột... Việc sử dụng 3 phác đồ điều trị đều cho hiệu quả cao, tuy nhiên việc sử dụng thuốc kháng sinh Ceftiofur cho hiệu quả cao hơn (95,08%) so với sử dụng Amoxicillin, Norfloxacin.
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