New Delhi, Nov. 17 -- Climate-tech startups are cashing in on India's post-Diwali pollution spike, as the toxic haze over Delhi-NCR pushes people toward everything from home purifiers to wearable clean-air devices-with each company aiming to target a specific slice of rising consumer anxiety.

Delhi's air quality slipped into the 'severe' zone and remained there for days after Diwali, as firecracker fumes mixed with cold winter stagnation - an annual pattern that sent purifier and mask sales surging on Amazon and Flipkart.

Amazon reported a 5x jump in air purifiers across regions and a 20x spike in Delhi-NCR, with premium models growing over 150% year-on-year. Flipkart saw Delhi-NCR purifier demand rise 8x in early November, while its qu...