[hadlock]

One thing I learned from the california wildfires, after buying an indoor air quality monitor, was that doing something as innocuous as baking a pizza in an ELECTRIC oven was enough to spike the AQI PM 2.5 air quality to 400, briefly (15 min) in our 1200 sq ft unit. In the bay area PM2.5 outdoors usually hovers between 5 and 35, with 75 being roughly when haze is noticeable at longer distances. 300+ is what happens when certain international cities have days-long fireworks festivals. I was measuring 400 with an electric oven cooking a frozen pizza from safeway.

Unless it's 115F outside or driving rain sideways onto the window, it's almost always wise to crack a window when cooking. Food throws off a ton of stuff, smoke and various compounds.

[dzhiurgis]

You need to open a window to make up for extractor. I also shut off HRV so it doesn’t spread fumes around the house.