This paper brings into attention of the indoor air specialists new information regarding the assessment of the potential cumulated impact of the air chemical compounds and microclimate factors on materials; for exemplification it was selected a wooden church made by oak and the monitoring values for temperature, humidity and the concentration of four chemical compounds with a destructive potential on organic materials generally: NO2, SO2, O3 and PM2.5.

Urbanization and the rise in the standard of living generated both a higher quantity of waste and the expansion of cities with the incorporation of solid waste landfills located originally outside. In many cities across Romania, landfills are placed very close to settlements, and in some cases even inside cities. Beside landfill activities, other companies that deal with waste sorting, recycling and treatment operates nearby. All these activities generate odorous compounds that create odour nuisance. The current study was conducted in order to evaluate the impact of a landfill located in a highly urbanized area using dynamic olfactometry with the main objective to assess the level of odour concentration and the impact on the population. Samples were taken around the landfill always from a point opposite to the wind direction. Also, in parallel with odour sampling it was determined the concentration of two main chemical specific compounds, NH3 and H2S, in order to verify the compliance with environmental legislation, and the level of VOC to establish a correlation with the odour level. Measurement results indicate a high level of odour concentration in most of the samples, a good correlation with VOC and frequent exceeded values for the specific chemical compounds. Annoyance level was also high and it was evaluated using FIDOL factors, which are Frequency, Intensity, Duration, Offensiveness and Location.

The paper presents the test results regarding the evaluation of the accuracy of the PM2.5 and PM10 particulate matter concentration measurement performed with the uRADMonitor A3 fixed air quality monitoring station produced by SC MAGNASCI SRL. The procedure involves the calculation of the accuracy elements: trueness and precision, based on the experimental data obtained by measuring the concentration of particulate matter using the tested analysers in parallel with the reference method, SR EN 12341: 2014, and analysis of data series by Pearson correlation and linear regression.Starting from the nowadays pollution reality, when the level of ambient air pollution is at an unprecedented level both in terms of the diversity of the identified pollutants in the air and the increasing concentrations [1-4], continuous and accurate monitoring is an important first step in the process of stopping and improving air quality. In accordance with ISO 5725 standard series -The accuracy (trueness and precision) of measurement methods and measurement results, accuracy reflects the degree of concordance between the result of an attempt and the accepted reference value. The general term of accuracy is used to refer to trueness and precision, at the same time.Evaluating the trueness of a method involves comparing the value of the acquired results by applying the tested method, which may be a certified reference material (if present) or may be the result of measurement by another method, preferably a reference one. The value of trueness is usually expressed by the trueness error, i.e. the difference between the value obtained by the tested equipment and the value obtained by the reference method. Precision is the general term for the variability of the results of a repeated measurement and is usually expressed based on the values of standard deviations obtained under repeatability/reproducibility conditions with a probability of 95%.The paper presents the procedure and the results obtained within a project that aimed the establish the accuracy of measurements of PM2.5 and PM10 made with uRADMonitor A3 a fixed air quality monitoring station ( fig. 1a); the trueness and variability were calculated, based on experimental data obtained by parallel measurement of the concentration of PM2.5 and PM10 using automatic monitors and the reference method, SR EN 12341:2014 and compared with the requirements of acceptability imposed by the regulations under these conditions:1)the variability condition: to be in line with the uncertainty established by the environmental regulations in force; 2)the Pearson correlation coefficient values, r ≥ 0.97 according to SR EN 14793: 2017 [5]; Pearson correlation and linear regression methods have been used to verify these requirements, these methods being more and more used in different areas of activity, including environmental protection [6][7][8][9]. Experimental partFor the test, PM2.5 and PM10 particulate matter were determined with two uRADMonitor monitors A and B in parallel with 2 Sven Leckel LVS3 typ...

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