Abstract
Based on the monitoring data of the Central Lab of Estonian Environmental Research Centre, the statistical parameters and temporal variations of the fine particulate matter PM<sub>10</sub> concentrations in the ambient air of North Estonian cities Tallinn, Kohtla-Järve and Narva have been analyzed. Variation trends of pollution levels have been identified. The fine particulate matter PM<sub>10</sub> average concentrations in the ambient air of the industrial cities of Northern Estonia have decreased on the average 0.1–0.2 μg/m<sup>3</sup> per month in the past 5 years. The level of monthly maximum average concentrations over 24-hour period has decreased particularly quickly with a decrease rate of 0.3 to 0.7 μg/m<sup>3</sup> per month. It is shown that there are considerably strong correlation between the fine particulate matter PM10 average concentrations and monthly maximum average concentrations over 24-hour period in the ambient air; the linear correlation coefficient is between 0.6 and 0.9. The created frequency distributions of fine particulate matter PM<sub>10</sub> concentrations allow assessing the probabilities of development of hazardous pollution situations.
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