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Why ultrafines?
Dr Lei Dong Presented by Mr Markku Rajala
A Company
>1 billion people suffer from poor air quality every day 每天有超过10亿人不得不生活在恶劣空气的环境中
With same parDcle mass you may get very different number and surface area of parDcles into your lungs 即使吸入肺部的颗粒物的质量一样,但是颗粒物的数量及表面积可能完全不一样
Different size parDcle affect your lungs differently 不用大小的颗粒物对肺部有不同的影响
OpDcal sensors do not measure <300 nm parDcles – and β-‐sensors are insensiDve to small parDcles 传统光学传感器监测不到小于300纳米的颗粒物 β- 射线法传感器对细微颗粒反应不灵敏
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Num
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Particle diamer (nm)
Particle number concentration Beijing
Measurement range of optical particle sensors
Electrical sensors based on parDcle charging measure all parDcles in 10 nm – 2.5 µm range 基于对颗粒物充电方法监测的电子传感器,可监测10纳米-‐2.5微米的所有颗粒物
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Num
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centratio
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Particle diamer (nm)
Particle number concentration Beijing
Measurement range of sensors based on electrical particle charging
Pegasor Urban Air Monitoring Equipment 佩卡索尔室外空气监测设备
Chargerpower
Electrometer
In = Iout - Iin
Iin
Iout
Sample in
Sample out
Isolated power transfer
Faraday cup
Aerosol charging
In
Pegasor’s technology 佩卡索尔公司技术
Future – direct measurement of health impact? 将来-‐ 直接测量对人体健康影响?
Conclusions 总结 • PM2.5 is a good indica/on of pollu/on but it underes/mates the health effect
caused by ultrafine par/cles PM2.5 是空气污染的重要指数,但是仅有PM2.5 的概念,低估了极细微颗粒
物对人体健康的影响 • Par/cle number (PN) and par/cle surface area (PA) concentra/ons are
important for beAer understanding of pollu/on vs health effect 颗粒物数量浓度(PN)及颗粒物表面积浓度(PA)可以更好的理解污染及健
康影响 • Measuring PN/PA1 (and especially PN/PA0.1) requires new measurement
technology based on electrical charging of par/cles 测量PN/PA1 (尤其是PN/PA0.1)需要基于对颗粒物充电的电子技术 • It may be possible to develop measurement equipment which can indicate
the poten/al health effect of par/culate maAer 可以直接反应颗粒物对健康的潜在影响,开发监测设备成为可能
Thank You! Pegasor Oy Hatanpään valta/e 34 C, FI-‐33100 Tampere, Finland [email protected]; +86 136 6127 1971 www. pegasor.fi