Sirsa, Haryana, just hit an AQI of 403, the highest in northern India and deep into the severe zone, according to the CPCB's SAMEER app.
Delhi wasn't far behind with a poor AQI of 299, while Hisar, Baghpat, and Panchgaon also clocked dangerously high numbers.
Delhi-NCR stage 3 bans vehicles, construction
Air this bad isn't just uncomfortable; it can mess with your breathing even if you're healthy.
With things getting worse, Delhi-NCR has moved to Stage 3 of its Graded Response Action Plan: That means bans on certain vehicles and construction work to try and bring pollution down.
Stay safe out there!