This is an excellent paper about the ozone concentrations in East and Southeast Asia. Key features are the quantity of surface stations in eight countries with different air quality standards, together with ozonesonde data from 10 sites. Another noticeable feature is the period investigated, which extended above 10 years in some sites. The authors presented the annual cycle of mean values, the 95^th percentile, the number of threshold exceedances and trends. Tropospheric ozone profiles are presented and their trends. Finally, a relationship with nitrogen oxides and temperature is considered. Since the paper is quite complete, only some minor comments should be required before its final acceptance.

Since the number of surface stations included in this study is noticeable, the authors could comment if noticeable outliers have been recorded, i.e. if there are stations that provide anomalous values.

The paper focus is on the high values. However, low values could be highlighted. The authors should indicate if such values belong to remote sites or if are linked to high concentrations of other substances.

The authors could indicate if it is possible to classify the stations following the ozone origin by transport or by precursors or if site classifications have been discarded.

Since the number of stations depends on the country. Some means presented in Figure 8 may be more robust against others. The authors could consider this fact.

Finally, the temperature is considered. However, meteorological features are varied in different latitudes. The synoptic pattern evolution may be quite different in the analysed region. The authors could comment the possible influence of such features on ozone concentrations.

Minor remarks.

L. 403. Dot instead of semicolon.

L. 580. Introduce one space in “forthe”.

L. 583. Introduce subscript in NO₂.

Please see attached document for full review