Between 6:00 pm and 8:00 pm, air quality was classified as “Unhealthy” according to the international Air Quality Index (AQI). In the hours that followed, pollution levels declined, and air quality first improved to the “Unhealthy for Sensitive Groups” category before reaching the “Moderate” category. According to the national air quality index, the citywide average readings were in the “Yellow” category for PM2.5 and the “Orange” category for PM10.

Overnight rainfall and wind speeds of around 4 m/s helped improve atmospheric circulation and created relatively favourable conditions for the dispersion of pollutants. As a result, concentrations of PM2.5 and PM10 in the near-surface air layer decreased compared with previous periods, contributing to improved air quality.

At the same time, increased atmospheric humidity may cause some automatic monitoring stations to record PM2.5 and PM10 concentrations higher than their actual levels.

In addition, specialists from the National Centre for Environmental Monitoring conducted instrumental measurements of ambient air quality overnight.

By the morning of 5 November, air quality had improved to the “Moderate” category under the international AQI, while readings under the national standard had reached the “Green” level. These conditions are expected to persist until around midday.

For reference: On 4 November, a digest of the key developments and measures aimed at improving air quality was published. It provides information on inspection raids and monitoring activities, meteorological conditions affecting air quality, the main sources of air pollution, the harmful effects of burning plant waste and the penalties for such violations, as well as other relevant updates.