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GROUND LEVEL OZONE AT THE SOUTHERN BULGARIAN BLACK SEA COAST FOR A TYPICAL SUMMER MONTH
Abstract
Ground level ozone (O3) is a photochemical pollutant with harmful effects on human health, vegetation and ecosystems. The focus of this work are ozone data measured at the synoptic station Ahtopol, a rural site at the southern Bulgarian Black Sea coast. The surrounding area is without big anthropogenic sources of air pollution, rich in biodiversity and protected zones by NATURA2000. From our summer campaigns data collected during the last years, we have selected for analysis July 2018 – a summer month with well-expressed breeze circulations and diurnal ozone cycle. 1-hourly O3 concentrations are in the range from 10-15 ?gm-3 to 120-140 ?gm-3. The monthly mean values at Ahtopol are 66.5 ?gm-3, with a maximum daily 8-h averaged concentrations of 107.1 ?gm-3. These values are higher than at the 2 regulatory urban air quality stations located at the coast 70-90 km northward of Ahtopol – Burgas (monthly mean 65.8 ?gm-3) and Nessebar (monthly mean 59.3 ?gm-3). We discuss the time evolution of O3 and meteorological parameters (wind, temperature) at Ahtopol during the month and analyze the mean diurnal ozone cycle at the three sites. Values above 90 ?gm-3 in Ahtopol extent from 11:00 to 16:00 LT and are linked to well-developed breeze circulation with winds from the sea at about 4-5 ms-1. The maximum daily 8-h averaged ozone concentrations has highest value of 107.15 ?gm-3, and for four days in middle of the month is above the 100 ?gm-3 guideline value of the World Health Organization with regard to negative impact of ozone on human health. Limit EU values at the three coastal sites were not exceeded.
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Ivanov D. M., D. G. Lazarov, A. P. Blagoev, V. C. Danchovski, E. H. Donev and Bo L.B. Wiman, (2011), A seventy nine days’ time-series of Black sea coastal ozone, aerosol, and meteorological parameters: statistical interrelationships, and implications, Bulgarian Geophysical Journal, 37 (1-4), 3-19.
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