Concentrationsthe period 2014018 in Bilbao. Periodogram of weekly beta activity concentrations over over the period 2014018 in Bilbao.Every year, maximum values are reached for the duration of autumn (October ovember ecember), while the minimum ones are registered during winter (January ebruaryMarch) (Figure 7). Box-plots describing the shape on the seasonal distribution of values and its variability support to summarize and compare this seasonal variability in the betaAtmosphere 2021, 12,7 ofThese final results agree together with the elements from the alpha activity Ibuprofen alcohol Protocol concentration identified and analyzed in previous studies at the exact same web page [16]. In this sense, a positive correlation among alpha and gross beta (0.67) was found, which can be explained by the principal source term of both the airborne alpha and gross beta concentration being the same in typical situations. Moreover, the alpha/beta ratio was calculated for each and every week. The average was 0.138, which is close towards the regular ratio of 0.1 [3] as well as to other values obtained in Spain (0.14 in Salamanca (west) [11]; 0.1 in Malaga (south) [9]; 0.2 within the Canary Islands (south) [13]; and close to 0.1 in Valencia (east) [8]). Nevertheless, despite the fact that the 7 Be values show seasonality and annual periodicity, the correlation with the beta activity values is negligible, with acorrelation worth of 0.16, which can be related towards the worth obtained within the Canary Islands (0.16) [13]. Each year, maximum values are reached throughout autumn (October ovemberDecember), even though the minimum ones are registered throughout winter (January ebruaryMarch) (Figure 7). Box-plots describing the shape from the seasonal distribution of values and its variability help to summarize and evaluate this seasonal variability in the beta activity concentrations. A constructive trend in the course of the year is shown, with all the calculated percentiles (i.e., the percentage of values that fall under the xth percentile) rising from winter to autumn inside the exact same year. The minimum value (P5) increases from 107 q/m3 to 224 q/m3 , when the maximum worth (P95) ranges from 803 q/m3 to 1315 q/m3 . The occurrence of your maximum in autumn just isn’t in line with previous operates analyzing beta activity concentrations carried out within the Iberian Peninsula [168], which Tromethamine (hydrochloride) custom synthesis showed that the maximum typical values are reached in the summer and that the minimum values are obtained inside the winter. Around the contrary, equivalent behaviour has been identified in other analyses, including in Milan [27] and New York [28]. This seasonal variation within the beta activity concentrations points to the potential effect of atmospheric things on these Atmosphere 2021, 12, x FOR PEER Evaluation 8 of 15 activities as a way to justify the heterogeneity of concentrations in distinct periods on the year, which will be investigated inside the next two sections.Figure 7. Total and seasonal box-whisker plots beta activity concentrations over the period 2014Figure 7. Total and seasonal box-whisker plots forfor beta activity concentrations more than the period 2018 in Bilbao. The rectangle represents the 50 of50 of information (interquartile from 25th (P25) to 75th 2014018 in Bilbao. The rectangle represents the data (interquartile variety variety from 25th (P25) (P75) percentile), the tiny cross identifies the imply, the continuous horizontal line inside the recto 75th (P75) percentile), the compact cross identifies the imply, the continuous horizontal line inside tangle identifies the median (50th percentile, P50), the squares and c.