The anti-smog guns throw fine mist from time-to-time to check the possibility of dust pollution emanating from the construction work in New Delhi, India on Dec. 05, 2021. As the National Capital Region (NCR) continues to battle high air pollution levels, the Delhi Metro Rail Corporation (DMRC) has pressed 14 Anti Smog Guns (ASGs) into service to combat dust pollution at the sites where it is constructing infrastructure for the metro rails. Photo Credit: Indian Photo Agency (InPA)