Police officers fire tear gas during a demonstration against a proposed extradition bill in Admiralty, Hong Kong, China, October 1, 2019. It was also the date of the 70th anniversary of the People's Republic of China Tear gas canisters fired on that day: 1667.

Police officers fire tear gas to disperse crowds while they march near the Central Government Office during a rally against a proposed extradition bill in Admiralty, Hong Kong, China, September 29, 2019. The rally is a joint movement with 60 other cities in 20 different countries. Tear gas canisters fired on that day: 347.

Police fire tear gas to disperse protestors in Wan Chai, Hong Kong, October 1, 2019. Tear gas fire on that day: 1667.

Police officers fire tear gas to protestors during a demonstration against a proposed extradition bill in Wan Chai, Hong Kong, China, November 2, 2019. The demonstration is held by the candidates of the district councils with their supporters, hoping the White House to pass the Hong Kong Human Rights and Democracy Act. Tear gas canisters fired on that day: 409.

Police officers fire tear gas to disperse activists who set up road barricades and paralyze traffic in Taipo, Hong Kong, China, August 5, 2019. The activists are trying to start a strike in different areas of Hong Kong against a proposed extradition bill by the Government. Tear gas canisters fired on that day: 1002.

Police officers fire tear gas to disperse activists who set up road barricades and paralyze traffic in MongKok, Hong Kong, China, November 11, 2019. Tear gas canisters fired on that day: 107. Tear gas canisters fired on that day: 255.

Police officers fire tear gas to disperse crowds who are using laser pointers pinning on the walls of the Sham Sui Po police station during an assembly against a proposed extradition bill in Sham Sui Po, Hong Kong, China, August 14, 2019. Sham Shui Po is one of the most densely populated area crowded with low income working class in Hong Kong. Tear gas canisters fired on that day: 36.

Police officers fire tear gas to disperse activists who set up road barricades and paralyze traffic in Tsim Sha Tsui, Hong Kong, China, August 3, 2019. Tear gas canisters fired on that day: 107.

Huge cloud of tear gas is seen outside a popular shopping mall in Causeway Bay, Hong Kong, China, November 2, 2019. The crossroad outside the shopping mall is one of the most densely populated area in the world. Police fire tear gas to disperse crowds in a demonstration which is held by the candidates for the district councils with their supporters, hoping the White House to pass the Hong Kong Human Rights and Democracy Act. Tear gas canisters fired on that day: 409.

Tear gas erupts outside the Chinese University of Hong Kong in Shatin, Hong Kong, China, November 17, 2019. The clash begins as police move in to clear the occupied campus and the protestors respond with bricks and petrol bombs. Tear gas canisters fired on that day: 2330.

Tear gas erupts outside the Hong Kong Polytechnic University in Tsim Sha Tsui, Hong Kong, China, November 17, 2019. The clash begins as police move in to clear the occupied campus and the protestors respond with bricks and petrol bombs. Tear gas canisters fired on that day: 1530.

A road barricade is seen in the middle of a highway while tear gas erupts outside the Hong Kong Polytechnic University in Hung Hum, Hong Kong, China, November 18, 2019. The clash breaks out when hundreds of wounded protestors are trying to leave the occupied campus and passing through police's cordon. Tear gas canisters fired on that day: 3293.