The provided chart compares the percentages of source contributions to annual average PM 2.5 concentrations in Tashkent.
Overall, boundary and windblown dust led the chart and with its the highest percentage, while waste burning remained as the least contributor. Furthermore, three of those sources – light industry, heavy industry and urban dust – showed almost same figures.
To begin with, boundary and windblown dust was the dominant source among others, making up about 36%, while its counterpart, residential heating, ranked the second place, as it made up around 29%. This figure decreased by 10%, when it comes to transport, contributing about 16% which was twenty percent lower than the dominant one.
By contrast, other sources, such as heavy and light industry, urban dusting, remained as the lower contributors, compared to former ones, as they showed about 6%, 7% and 6%, which differed by mere 1% respectively. At the bottom, waste burning showed the lowest percentage, made up about 1%.