Tokyo 2020 Olympics - Handball - Women - Group A - South Korea v Angola - Yoyogi National Stadium - Tokyo, Japan - August 2, 2021. Staff members clean the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Table Tennis - Men's Team - Last 16 - Tokyo Metropolitan Gymnasium - Tokyo, Japan - August 1, 2021. Volunteer cleans table during break in match REUTERS/Luisa Gonzalez

Tokyo 2020 Olympics - Table Tennis - Men's Singles - Gold medal match - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 30, 2021. A volunteer cleans the table during the match between Fan Zhendong of China and Ma Long of China Pool via REUTERS/Antonin Thuillier

Tokyo 2020 Olympics - Handball - Men - Group B - Portugal v Denmark - Yoyogi National Stadium - Tokyo, Japan - July 30, 2021. Kevin Moeller of Denmark adjusts his clothing as staff members clean the floor REUTERS/Susana Vera

A man cleans a tent during an evacuation of a camp made of tents, set up by NGO activists to draw attention to the living conditions of migrants and to demand accommodation for them, at Place des Vosges in Paris, France, July 30, 2021. REUTERS/Sarah Meyssonnier

A worker cleans windows in the media center at Ariake Tennis Park at the Tokyo 2020 Olympic Games, Japan, July 30, 2021. REUTERS/Mike Segar

Tokyo 2020 Olympics - Handball - Men - Group A - Argentina v Brazil - Yoyogi National Stadium - Tokyo, Japan - July 30, 2021. Staff member cleans the floor during half time REUTERS/Gonzalo Fuentes

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles meets with founder Dorcas Sinclair and her husband Allan Sinclair during a visit to Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles meets founder Dorcas Sinclair during a visit to Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Britain's Prince Charles visits Caithness Beach Clean Group at Scrabster Beach, in Thurso, Caithness, as part of a two-day visit to Scotland, Britain July 29, 2021. Paul Campbell/Pool via REUTERS

Tokyo 2020 Olympics - Handball - Women - Group A - Montenegro v Norway - Yoyogi National Stadium - Tokyo, Japan - July 29, 2021. Staff members clean the floor and goal posts during half rime REUTERS/Gonzalo Fuentes

Tokyo 2020 Olympics - Table Tennis - Men's Singles - Semifinal - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 29, 2021. A volunteer cleans a table during match between Fan Zhendong of China and Lin Yun-Ju of Taiwan Pool via REUTERS/Antonin Thuillier

Tokyo 2020 Olympics - Boxing - Women's Flyweight - Last 16 - Kokugikan Arena - Tokyo, Japan - July 29, 2021. The boxing ring is cleaned after session 11 of boxing events. REUTERS/Ueslei Marcelino

Tokyo 2020 Olympics - Boxing - Women's Flyweight - Last 16 - Kokugikan Arena - Tokyo, Japan - July 29, 2021. The boxing ring is cleaned after session 11 of boxing events. REUTERS/Ueslei Marcelino

Tokyo 2020 Olympics - Handball - Women - Group A - Netherlands v Angola - Yoyogi National Stadium - Tokyo, Japan - July 29, 2021. Staff members clean the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Women - Group A - Netherlands v Angola - Yoyogi National Stadium - Tokyo, Japan - July 29, 2021. A staff member cleans the floor of the corridors leading to the stadium before the match REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group A - Brazil v Spain - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Team member cleans the goal post after the match REUTERS/Gonzalo Fuentes

Tokyo 2020 Olympics - Table Tennis - Women's Singles - Quarterfinal - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 28, 2021. Volunteer cleans between matches REUTERS/Thomas Peter

Tokyo 2020 Olympics - Table Tennis - Women's Singles - Quarterfinal - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 28, 2021. Volunteers clean the area after match between Sun Yingsha of China and Ying Han of Germany REUTERS/Thomas Peter

Tokyo 2020 Olympics - Handball - Men - Group B - Japan v Egypt - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Staff member cleans the goal post after the match REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Japan v Egypt - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Staff members clean the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Japan v Egypt - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Staff members clean the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Sweden v Portugal - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Team member cleans the goal post REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Sweden v Portugal - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Staff member cleans the floor REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Denmark v Bahrain - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. Staff members cleaning the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Handball - Men - Group B - Denmark v Bahrain - Yoyogi National Stadium - Tokyo, Japan - July 28, 2021. A staff member wearing a protective face mask cleans the floor inside the stadium before the match REUTERS/Susana Vera

People clean debris in front of their house after heavy rain caused flooding in towns surrounding Lake Como in northern Italy, in Laglio, Italy, July 27, 2021. REUTERS/Flavio Lo Scalzo

Tokyo 2020 Olympics - Tennis - Women's Singles - Round 3 - Ariake Tennis Park - Tokyo, Japan - July 27, 2021. A volunteer cleans a tennis court REUTERS/Piroschka Van De Wouw

Tokyo 2020 Olympics - Handball - Women - Group A - Japan v Montenegro - Yoyogi National Stadium - Tokyo, Japan - July 27, 2021. Staff cleaning the floor after the match REUTERS/Gonzalo Fuentes

Tokyo 2020 Olympics - Table Tennis - Mixed Doubles - Bronze medal match - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 26, 2021. Volunteers clean the table after Bronze medal match REUTERS/Thomas Peter

Tokyo 2020 Olympics - Handball - Men - Group B - Bahrain v Portugal - Yoyogi National Stadium - Tokyo, Japan - July 26, 2021. staff cleaning the floor during half time REUTERS/Gonzalo Fuentes

A member of the staff wearing a protective face mask cleans and sprays sanitizer over seats in the Miyagi Stadium, during the Tokyo 2020 Olympic Games, in Sendai, Miyagi prefecture, Japan, July 26, 2021. REUTERS/Amr Abdallah Dalsh

A member of the staff wearing a protective face mask cleans and sprays sanitizer over seats in the Miyagi Stadium, during the Tokyo 2020 Olympic Games, in Sendai, Miyagi prefecture, Japan, July 26, 2021. REUTERS/Amr Abdallah Dalsh


Tokyo 2020 Olympics - Handball - Men - Group A - Spain v Norway - Yoyogi National Stadium - Tokyo, Japan - July 26, 2021. Staff cleaning the floor during the match REUTERS/Gonzalo Fuentes

Tokyo 2020 Olympics - Handball - Men - Group A - Spain v Norway - Yoyogi National Stadium - Tokyo, Japan - July 26, 2021. Staff cleaning the floor during half time REUTERS/Gonzalo Fuentes

Rapid urbanisation and chronic traffic are contributing factors to poor air quality in the Indonesian capital, alongside nearby coal-fired power plants, according to the Center on Energy and Clean Air.

Tokyo 2020 Olympics - Basketball - Men - Group B - Australia v Nigeria - Saitama Super Arena, Saitama, Japan - July 25, 2021. Staff members clean the floor during the half time REUTERS/Brian Snyder

A man walks as he cleans his house which was affected by heavy rainfall in Dinant, Belgium July 25, 2021. REUTERS/Johanna Geron

A man carrying boots and cleaning equipment walks through a damaged road following heavy rainfall in Dinant, Belgium July 25, 2021. REUTERS/Johanna Geron

Tokyo 2020 Olympics - Judo - Men's 66kg - Last 32 - Nippon Budokan - Tokyo, Japan - July 25, 2021. Staff member cleans the mat during match REUTERS/Sergio Perez

Tokyo 2020 Olympics - Handball - Women - Group B - Russian Olympic Committee v Brazil - Yoyogi National Stadium - Tokyo, Japan - July 25, 2021. Staff cleaning the floor during half time REUTERS/Gonzalo Fuentes

A man cleans after heavy rainfall in Pepinster, Belgium July 24, 2021. REUTERS/Johanna Geron TPX IMAGES OF THE DAY

Men clean after heavy rainfall in Pepinster, Belgium July 24, 2021. REUTERS/Johanna Geron

People clean up a retirement home affected by floods caused by heavy rainfalls in Erftstadt, Germany, July 24, 2021. REUTERS/Sergiy Karazy

Tokyo 2020 Olympics - Gymnastics - Artistic - Men's Parallel Bars - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 24, 2021. Staff cleans the floor. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Handball - Men - Group A - Germany v Spain - Yoyogi National Stadium - Tokyo, Japan - July 24, 2021. Staff member cleans the floor during half time REUTERS/Susana Vera

Tokyo 2020 Olympics - Tennis Training - Ariake Tennis Park, Tokyo, Japan - July 23, 2021 - Olympics personnel clean seats in the venue. REUTERS/Mike Segar

Tokyo 2020 Olympics - Tennis Training - Ariake Tennis Park, Tokyo, Japan - July 23, 2021 - Olympics personnel clean seats in the venue. REUTERS/Mike Segar

Members of a technical aid organization clean the debris after heavy rainfalls in Bad Neuenahr-Ahrweiler, along Ahr river in Rhineland-Palatinate state, Germany, July 22, 2021. REUTERS/Christian Mang

People clean the debris after heavy rainfalls in Bad Neuenahr-Ahrweiler, along Ahr river in Rhineland-Palatinate state, Germany, July 22, 2021. REUTERS/Christian Mang

Tokyo 2020 Olympics - Gymnastics Artistic Training - Ariake Gymnastics Centre, Tokyo, Japan - July 22, 2021 Volunteers clean the surfaces during training REUTERS/Dylan Martinez

Tokyo 2020 Olympics - Gymnastics Artistic Training - Ariake Gymnastics Centre, Tokyo, Japan - July 22, 2021 Volunteers clean the surfaces before training REUTERS/Athit Perawongmetha

Tokyo 2020 Olympics - Gymnastics Artistic Training - Ariake Gymnastics Centre, Tokyo, Japan - July 22, 2021 Volunteers clean the surfaces before training REUTERS/Athit Perawongmetha