Highlights We investigated the change in visitation of urban green spaces (UGS) during COVID-19 pandemic. Social isolation reduced extent, type and distance of visited UGS on the basis of legal restrictions. Reasons for visiting UGS changed from non-essential before the pandemic to essential during it. Respondents missed visiting UGS regardless of the view of UGS from their window. Respondents expressed the need for UGS integrated within the urban fabric.

In an increasingly urbanized world, air pollution mitigation is considered one of most important issues in city planning. Urban trees help to improve air quality by facilitating widespread deposition of various gases and particles through the provision of large surface areas as well as through their influence on microclimate and air turbulence. However, many of these trees produce wind‐dispersed pollen (a known allergen) and emit a range of gaseous substances that take part in photochemical reactions – all of which can negatively affect air quality. The degree to which these air‐quality impacts are manifested depends on species‐specific tree properties: that is, their “traits”. We summarize and discuss the current knowledge on how such traits affect urban air pollution. We also present aggregated traits of some of the most common tree species in Europe, which can be used as a decision‐support tool for city planning and for improving urban air‐quality models.

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