The collateral for DAI are hihgly crypto correlated - 43.8% USDC, 32.1% ETH, 11.3% WBTC, 5.9% USDP, and others. ETH and WBTC are just Ethereum and BTC, both of which have dropped considerably recently. USDP somehow dropped to ~$0 since April. USDC is sworn to be 100% USD backed so let's take that at face value.

DAI is said to have 150% over-collateralization. ETH & WBTC have dropped more than half. Let's say just off by 50%. USDP and others seem got wiped out. $150 x (43.8% + 32.1%/2 + 11.3%/2 + 0%) = ~$98. That means $150 of collateral is worth only ~$98 now, not enough to back $100 of DAI for 1-to-$1 redemption.

Looks like DAI is at the verge of de-pegging.