India, Jan. 11 -- An Instagram video showing a foreigner cleaning his air purifier filter in Delhi has reignited concerns over the capital's worsening air quality. The clip, shared by Andy Evans, has drawn thousands of views and a flood of reactions from social media users alarmed by the extent of pollution captured in just 2 months.

In the video, Evans, who goes by the name Aussie Bhai on Instagram, is seen pulling out an air purifier filter that should typically appear white or light grey after regular use. Instead, the filter appears completely black, layered with thick dust and particulate matter.

"All last night while I was asleep I was thinking, I probably should clean my air purifiers," Evans said in the clip. "So I literally jus...