cities: CO is about 90%, Hydrocarbon about 60%, NOx about 50%. Existing engine vehicles use lead petrol so air pollutants from traffic also remain Pb, moreover remarkable SPM from burning product and from road. 4.2 Air pollution level in 4.2.1 in workplace Air pollutants’ concentration Air pollution level in workplace at factories, especially factories are arranged polluting type mentioned above, is considerable. Measuring results in many years show that pollution level at some factories be one of metallurgy, wood processing, rubber, cement, chemical industry… Concentration of some pollutants are rather high, some are higher than allowable concentration. Table 1, present some results to illustrate for this remark. Table 2: Pollutants concentration in workshop environment at some enterprises TT Name concentration (mg/m3) Noise Pollutants’ Level SPM SO2 NO2 CO Others (dB) 1 Ha Tien cement factory 18.3 0.82 120 2 Tan Binh steel factory 7.2 0.25 38.5 86 3 Nha Be steel factory 16 4.2 0.49 12 82 4 Phi Hung aluminum 6.0 0.55 0.07 40 89 5 Thu Duc Cashew nuts 0.51 0.04 11 0.198 1 87 processing mill 6 Posvina tole factory 1.25 0.05 100 2 7 Satimex wood factories 9.7 1.0 95 8 Tarubchimex Rubber 0.5 0.04 0.08 62 factory Allowable concentration 6.0 20 - 40 90 (AC) Above results gathered from many sources in many years 1 : Phenol concentration (AC: 0,01); 2: HCl concentration (AC: 10) Note: 4.2.2. Air pollution at Road side Monitoring results in many continuous years at positions: Hang Xanh roundabout, Dien Bien Phu Dinh Tien Hoang crossroad, Phu Lam roundabout shows that SPM is always higher 2-6 – times than allowable concentration, concentration of other pollutants sometimes are more than allowable concentrations. Result of 2001 at monitoring sites is present in figures following page.
cities: CO is about 90%, Hydrocarbon about 60%, NOx about 50%. Existing engine vehicles use lead petrol so air pollutants from traffic also remain Pb, moreover remarkable SPM from burning product and from road. 4.2 Air pollution level in 4.2.1 Air pollutants’ concentration in workplace Air pollution level in workplace at factories, especially factories are arranged polluting type mentioned above, is considerable. Measuring results in many years show that pollution level at some factories be one of metallurgy, wood processing, rubber, cement, chemical industry… Concentration of some pollutants are rather high, some are higher than allowable concentration. Table 1, present some results to illustrate for this remark. Table 2: Pollutants concentration in workshop environment at some enterprises TT Name Pollutants’ concentration (mg/m3) Noise Level (dB) SPM SO2 NO2 CO Others 1 2 3 4 5 6 7 8 Ha Tien cement factory Tan Binh steel factory Nha Be steel factory Phi Hung aluminum Thu Duc Cashew nuts processing mill Posvina tole factory Satimex wood factories Tarubchimex Rubber factory 18.3 7.2 16 6.0 0.51 1.25 9.7 0.5 4.2 0.55 0.04 0.82 0.25 0.49 0.07 0.04 0.05 0.08 38.5 12 40 11 1.0 0.198 1 100 2 120 86 82 89 87 95 62 Allowable concentration (AC) 6.0 20 - 40 90 Above results gathered from many sources in many years Note: 1 : Phenol concentration (AC: 0,01); 2: HCl concentration (AC: 10) 4.2.2. Air pollution at Road side Monitoring results in many continuous years at positions: Hang Xanh roundabout, Dien Bien Phu – Dinh Tien Hoang crossroad, Phu Lam roundabout shows that SPM is always higher 2-6 times than allowable concentration, concentration of other pollutants sometimes are more than allowable concentrations. Result of 2001 at monitoring sites is present in figures following page.
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