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1943年南威尔士采煤工业部门采用奥恩斯尘粒计数器进行尘粒计数来监测粉尘。粉尘计数标准规定,每立方厘米空气中测得的0～10μm 粒度级的平均粒度数不得超过700粒/cm~3(PPCC),在1小时内至少采12个试样,其中尘粒数超过1500粒/cm~3的不得多于10%(Phillips)。这个标准没有考虑
In 1943, the coal mining industry in South Wales used the Orns Dust Counter for dust counting to monitor dust. Dust count standards, the average particle size of 0 ~ 10μm particle size measured per cubic centimeter of air shall not exceed 700 particles / cm ~ 3 (PPCC), at least 12 samples taken within 1 hour, in which the number of dust particles exceeds 1500 grains / cm ~ 3 no more than 10% (Phillips). This standard is not considered