People wear face masks as they visit Sidi Bou Said, an attractive tourist destination, amid concerns about the spread of the coronavirus disease (COVID-19), near Tunis, Tunisia July 30, 2021. REUTERS/Ammar Awad

Tokyo 2020 Olympics - Hockey - Men's Pool B - Germany v Netherlands - Oi Hockey Stadium, Tokyo, Japan - July 30, 2021. Members of the staff wearing protective face masks are pictured on the pitch before the match. REUTERS/Corinna Kern

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask looks on REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask reacts REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask reacts REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wearing a face mask in action REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's 5000m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Fan wearing a mask inside the stadium during Heat 2 REUTERS/Lucy Nicholson

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's Shot Put - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Raven Saunders of the United States wears a face mask REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Members of staff wearing protective face masks and rain ponchos tend to equipment on the track during rainy weather conditions REUTERS/Lucy Nicholson

Tokyo 2020 Olympics - Athletics - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Members of staff wearing protective face masks and rain ponchos tend to equipment on the track during rainy weather conditions REUTERS/Lucy Nicholson

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask celebrates on the podium alongside bronze medallist Hannes Aigner of Germany wearing protective a face mask REUTERS/Yara Nardi

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Silver medallist Jakub Grigar of Slovakia wearing a protective face mask poses on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic, silver medallist Jakub Grigar of Slovakia and bronze medallist Hannes Aigner of Germany wearing protective face masks pose on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask puts the medal around his neck on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic, silver medallist Jakub Grigar of Slovakia and bronze medallist Hannes Aigner of Germany wearing protective face masks pose on the podium REUTERS/Yara Nardi

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask on the podium REUTERS/Yara Nardi

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Silver medallist Jakub Grigar of Slovakia wearing a protective face mask poses on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Bronze medallist Hannes Aigner of Germany wearing a protective face mask celebrates on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask puts his medal around his neck on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask celebrates on the podium REUTERS/Yara Nardi

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask on the podium alongside silver medallist Jakub Grigar of Slovakia and bronze medallist Hannes Aigner of Germany wearing protective face masks REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask celebrates on the podium REUTERS/Yara Nardi

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask on the podium reacts REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask celebrates on the podium REUTERS/Stoyan Nenov

Tokyo 2020 Olympics - Canoe Slalom - Men's K1 - Medal Ceremony - Kasai Canoe Slalom Centre, Tokyo, Japan - July 30, 2021. Gold medallist Jiri Prskavec of Czech Republic wearing a protective face mask on the podium alongside silver medallist Jakub Grigar of Slovakia and bronze medallist Hannes Aigner of Germany wearing protective face masks REUTERS/Yara Nardi

Tokyo 2020 Olympics - Athletics - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Member of staff wearing a protective face mask and a rain poncho inside the stadium during rainy weather conditions REUTERS/Lucy Nicholson

Tokyo 2020 Olympics - Athletics - Women's 100m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Members of staff wearing protective face masks and rain ponchos tend to equipment on the track during rainy weather conditions REUTERS/Lucy Nicholson

Tokyo 2020 Olympics - Athletics - Women's 100m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. General view of a member of staff wearing a protective face mask and the rainy weather conditions seen at trackside REUTERS/Andrew Boyers

Tokyo 2020 Olympics - Gymnastics - Trampolining - Women's Individual Trampoline - Medal Ceremony - Ariake Gymnastics Centre - Tokyo, Japan July 30, 2021. Silver medallist Liu Lingling of China wears her medal REUTERS/Mike Blake

Tokyo 2020 Olympics - Gymnastics - Trampolining - Women's Individual Trampoline - Final - Ariake Gymnastics Centre - Tokyo, Japan - July 30, 2021 Liu Lingling of China wearing a face mask celebrates winning with the Chinese flag REUTERS/Lisi Niesner

Tokyo 2020 Olympics - Gymnastics - Trampolining - Women's Individual Trampoline - Medal Ceremony - Ariake Gymnastics Centre - Tokyo, Japan July 30, 2021. Gold medallist Zhu Xueying of China wears her medal REUTERS/Mike Blake

Tokyo 2020 Olympics - Gymnastics - Trampolining - Women's Individual Trampoline - Final - Ariake Gymnastics Centre - Tokyo, Japan - July 30, 2021 Liu Lingling of China wearing a face mask celebrates winning with the Chinese flag REUTERS/Lisi Niesner

Tokyo 2020 Olympics - Archery - Women's Individual - Quarterfinals - Yumenoshima Archery Field, Tokyo, Japan - July 30, 2021. Mackenzie Brown of the United States wears a national flag in her arrow bag REUTERS/Clodagh Kilcoyne

Tokyo 2020 Olympics - Archery - Women's Individual - Quarterfinals - Yumenoshima Archery Field, Tokyo, Japan - July 30, 2021. Mackenzie Brown of the United States wears a national flag in her arrow bag REUTERS/Clodagh Kilcoyne

A woman wearing a protective mask walks on the sidewalk of the road near a traditional market amid of the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, July 30, 2021. REUTERS/Willy Kurniawan

Tokyo 2020 Olympics - Athletics - Women's 100m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. Fan wearing a mask holding a China flag REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Sailing - Women's Laser Radial - Opening Series - Enoshima Yacht Harbour - Tokyo, Japan - July 30, 2021. People wearing face masks and Tokyo 2020 uniforms watch the race. REUTERS/Carlos Barria

Tokyo 2020 Olympics - Athletics - Women's 100m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. A fan wearing a face mask holds the Chinese flag REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Athletics - Women's 100m - Round 1 - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. A fan wearing a face mask holds the Chinese flag REUTERS/Kai Pfaffenbach

Tokyo 2020 Olympics - Rugby Sevens - Women - Pool A - New Zealand v Russian Olympic Committee - Tokyo Stadium - Tokyo, Japan - July 30, 2021. A volunteer wearing a protective face mask takes shelter as he waits for the rain to stop. REUTERS/Siphiwe Sibeko

Tokyo 2020 Olympics - Athletics - Men's High Jump - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. People wear face masks in the stands REUTERS/Fabrizio Bensch

Tokyo 2020 Olympics - Athletics - Men's High Jump - Qualification - OLS - Olympic Stadium, Tokyo, Japan - July 30, 2021. People wear face masks in the stands REUTERS/Fabrizio Bensch

Tokyo 2020 Olympics - Hockey - Women's Pool A - South Africa v Germany - Oi Hockey Stadium, Tokyo, Japan - July 30, 2021. People wearing protective face masks spectate the match. REUTERS/Corinna Kern

Tokyo 2020 Olympics - Swimming - Men's 200m Backstroke - Medal Ceremony - Tokyo Aquatics Centre - Tokyo, Japan - July 30, 2021. Evgeny Rylov of the Russian Olympic Committee wearing a face mask poses with the gold medal REUTERS/Carl Recine

Tokyo 2020 Olympics - Swimming - Men's 200m Backstroke - Medal Ceremony - Tokyo Aquatics Centre - Tokyo, Japan - July 30, 2021. Evgeny Rylov of the Russian Olympic Committee wearing a face mask poses with the gold medal REUTERS/Carl Recine