2. Data and Methods2.1 Experimental

2. Data and Methods
2.1 Experimental set–up, air quality, and meteorological data
The capital of Romania, Bucharest (approx. 44°26’N, 26°06’E),
represents the most developed city of the country, and is located
less than 70 km North from the Danube River. Detailed information
about city can be found in the Supporting Material (SM). The
monitoring sites of the Air Quality Network of Bucharest (Figure 1)
are distributed at different spatial levels (inner core city, larger
urban zone and sub–city area) covering the main types of anthro‐
pogenic activities: