Carcinogenic organic content of particulate matter at urban locations with different pollution sources.

. In this paper we evaluate characteristics of three optical particulate matter sensors/sizers (OPS): high-end spectrometer
11-D (Grimm, Germany), low-cost sensor OPC-N2 (Alphasense, United Kingdom) and in-house developed MAQS
(Mobile Air Quality System), which is based on another
low-cost sensor – PMS5003 (Plantower, China), under realistic conditions of strong and mild urban pollution. Results were compared against a reference
gravimetric system, based on a Gemini (Dadolab, Italy), 2.3 m 3  h −1 air sampler, with two channels (simultaneously measuring PM 2.5 and PM 10 concentrations).
The measurements were performed in Sarajevo, the capital of Bosnia-Herzegovina, from December 2019 until May 2020.
This interval is divided into period 1 – strong pollution – and period 2 – mild pollution. The city of Sarajevo is one of the most polluted cities in Europe in terms of particulate matter: the average concentration of PM 2.5 
during the period 1 was 83  µ g m −3 , with
daily average values exceeding 500  µ g m −3 . During period 2, the average concentration of
PM 2.5 was 20  µ g m −3 . These conditions represent a good opportunity to test optical devices against the reference instrument in a wide range of ambient particulate matter (PM) concentrations. The effect of an in-house developed diffusion dryer for 11-D is discussed as well. In order to analyse the mass distribution of particles, a scanning mobility particle sizer (SMPS), which together with the 11-D spectrometer gives the full spectrum from nanoparticles of diameter 10 nm to coarse particles of diameter 35  µ m, was used.
All tested devices showed excellent correlation with the
reference instrument in period 1, with R2 values between 0.90 and 0.99 for daily average PM concentrations. However, in period 2, where the range of concentrations was much narrower,
 R2 values decreased significantly, to values from 0.28 to 0.92. We have also included results of a 13.5-month long-term comparison of our MAQS sensor with a nearby beta attenuation monitor (BAM) 1020 (Met One Instruments, USA) operated by the United States Environmental Protection Agency (US EPA), which showed similar correlation and no observable change in performance over time.

/pdf/evaluation-of-optical-particulate-matter-sensors-under-43a3yi8ndf.pdf

Evaluation of optical particulate matter sensors under realistic conditions of strong and mild urban pollution

This paper examines atmospheric concentrations of particulate matter with an aerodynamic diameter smaller than 10 μm (PM10) and related particle-phase toxic heavy metals Cd, Ni, and Pb during domestic heating seasons from 2010 to 2019 in Sarajevo, Bosnia and Herzegovina In total, 242 daily PM10 samples were collected using medium and high volume air samplers The mean daily PM10 mass concentration for all measurements is 7516 μg/m3 (with the range of 2877–14900 μg/m3) Variation of ambient PM10 was observed throughout the study in different years Hourly values for PM10 measurements during two heating seasons are also presented Metal concentrations in PM10 were analyzed by electrothermal atomic absorption spectrometry (ETAAS) Quantities of atmospheric mass concentrations of studied trace metals were observed in the following order: Pb > Ni > Cd The mean concentrations of metals varied with Pb showing the highest concentration (ranging from 138 to 23400 ng/m3), Ni ranging from 087 to 4243 ng/m3, and Cd showing the lowest concentration ranging from 026 to 1009 ng/m3 The concentration of Pb and Cd in PM10 was strongly correlated, suggesting a common source or dependence of these metals in PM10 in Sarajevo Bioaccessibility of metals in the synthetic gastric juice was also estimated The quantities of average bioaccessible metal fractions in PM10 samples showed the following trend: Cd > Pb > Ni The health risk assessment shows that the population of Sarajevo is at increased lifetime risk of experiencing cancer because of exposure to these Cd concentrations in PM10 In addition, parallel PM10 sampling on two samplers showed that obtained results are highly comparable

Analysis of PM10, Pb, Cd, and Ni atmospheric concentrations during domestic heating season in Sarajevo, Bosnia and Herzegovina, from 2010 to 2019

In this study, the (copper sulfide)-carrageenan nanocomposite was grown from the interface of gel (Cu-complexed carrageenan) and liquid (sulfide solution). The thin film of the nanocomposite was coated on a platinum interdigitated electrode in order to be used as a relative humidity (RH) sensor. Data from the sensor was acquired by the low-cost, wireless and portable data acquisition hardware (DAQ) device built from the Arduino and 16-bit analog-to-digital converter. The LabVIEW VI was programmed to plot and save voltage output received from the prototype through Bluetooth communication. The sensor responses to RH variation were compared simultaneously with a reference sensor installed in the same prototype, which allows a real-time data acquisition of high accuracy. Importantly, the sensor exhibited a high reversibility as well as a linear response towards RH between 8% and 80 %.

Real-time humidity sensing by integration of copper sulfide nanocomposite with low-cost and wireless Arduino platform

https://doi.org/10.1016/j.apr.2022.101374

Evaluation of two collocated federal equivalent method PM2.5 instruments over a wide range of concentrations in Sarajevo, Bosnia and Herzegovina

Vertical temperature profiles represent a very important factor for various analytical and numerical studies, such as weather forecasts, air pollution models and CFD simulations These temperature profiles are especially important during the winter periods, when temperature inversions occur The cities in the natural valleys, such as the city of Sarajevo, B&H, are strongly affected by this phenomenon In this paper, a method for quantitative characterization of vertical temperature profiles, which is based on the in-house developed data acquisition system and the unmanned aerial vehicle, is presented Comprehensive calibration and verification procedure was performed and explained in details Field measurements were focused on the winter period and extreme temperature inversion scenarios The correlation with the air pollution in the city, for the same period, was discussed as well

/pdf/experimental-study-of-temperature-inversions-above-urban-5g41rkntwo.pdf

Experimental study of temperature inversions above urban area using unmanned aerial vehicle

/pdf/temperature-inversion-measurements-in-sarajevo-valley-using-2dr6f9nhwq.pdf

Temperature Inversion Measurements in Sarajevo Valley Using Unmanned Aerial Vehicles

/pdf/calibration-and-assessment-of-low-cost-dust-sensors-3eznr0dk4n.pdf

Rajfa Musemic

Papers

Experimental study of temperature inversions above urban area using unmanned aerial vehicle

Temperature Inversion Measurements in Sarajevo Valley Using Unmanned Aerial Vehicles

Calibration and Assessment of Low-Cost Dust Sensors