Verification And Application Of Wearable Air Pollution Monitor Based On Personal Exposure

The wearable instrument of air pollutant monitoring can be used for accurate measurement of personal exposure,verifying the accuracy of its monitoring results have practically significant.In this study,the metrical effect of wearable apparatus particlulate matters was verified by various verification methods.Firstly,the performance of particlulate matters detection was tested and adjusted in laboratory.Secondly,in order to verify the stability and accuracy of the wearable instrument,the monitoring results of the device,super atmospheric monitoring station,national monitoring station and gravimetric method in different environmental air and personal exposure were compared and analysed.Finally,by comparing its measurement results with gravimetric method to prove the stability and accuracy of monitoring on particulate matters in Baoding,and monitoring personal exposure to air pollution using the wearable instrument.The health risk of personal exposure to PM_2.5 was assessed.Several meaningful results were obtained:（1）The instrument to be verified had favorable performance of detecting particulate matters under different concentration gradients.The results of the instrument to be verified and the standard mass concentration measuring instrument were analyzed by linear regression,the R² of which was over0.95.The calibration coefficients of the PM_2.5 and PM₁₀ were respectively between1.5².8 and 1.3².1 within the range of 0⁵00μg/m³.（2）It obtained the better stability and effect of monitoring the concentration of PM_2.5 and PM₁₀0 using the instrument to be verified after calibration.Using linear regression to analyze the monitoring results on PM_2.5 and PM₁₀between the instrument to be verified and atmospheric monitoring super station,national monitoring station.The value of k,b,r were（0.79⁰.87,6.90¹0.81,0.96⁰.96）,（0.83⁰.86,5.52⁸.49,0.95⁰.96）and（0.81⁰.89,5.82¹0.58,0.94⁰.95）,（1.02¹.03,57.48⁶0.03,0.93⁰.93）,respectivly.The indices met the verification requirements except for the larger error of intercept b between PM₁₀ and the national monitoring station.Furthermore,the difference among the results hadno statistical significance using variance analysis（p>0.05）.Comparing with the gravimetric method,the relative error of over 90%PM_2.5.5 and PM₁₀ monitoring results were 0.46%²4.00%under different environment which were lowerthan the verification requirements.The verification results indicated that the performance of the instrument to be verified was stability and accuracy.（3）During the study period,the levels of PM_2.5 and PM₁₀ were higher in different environmental condition in Baoding.It presented differences in spatial,age and occupational about the personal average exposure of volunteers.The average concentrations of PM_2.5 and PM₁₀ in different places were 214μg/m³ and 253μg/m³,respectively.The personal exposure levels and dose of PM_2.5were 93.52μg/m³ and 0.01 mg/（kg·d）,and it presented as outdoor>indoor>sleep environment.Moreover,volunteers who over 60 years old and pupils showed higher PM_2.5 exposure level and dose.（4）During the study period,there were potential non-carcinogenic health risks in outdoor exposure to PM_2.5 for different populations.The risk index was 1.49.The risk of indoor and sleeping exposure could be ignored,the risk indices which were0.48 and 0.32,respectively.The health risk of PM_2.5 presented as outdoor>indoor>sleep environment.The verification results showed that the performance of the instrument to be verified was stability and accuracy after calibration,and it could be widely used in the accuracy measurement of personal exposure to particulate matters on a large scale,which could provide technical supports to develop and realize the accuracy prevention and control of air pollution risk in China.