Domestic and international travel curbs conversely showed little impact on local air pollution.
Britain could implement tougher COVID-19 measures.
Authorities said they could declare a health emergency if pressure on hospitals worsened.
More than 80% of Spain's population has been fully vaccinated against COVID-19.
The number of illegal parties has risen in recent weeks.
Young people wait to take a voluntary antigen test for the coronavirus disease
The Balearic government approved certain restrictions that apply specifically to parts of Magalluf and Sant Antoni in Ibiza.