The AQI Hit 180 and I Was 28 Weeks Pregnant. Here Is What My OB Actually Said.
I woke up Tuesday morning to a text from my clinic. "Air quality advisory. Limit outdoor activity." I looked out the window. The sky was orange. Not the pretty sunset kind. The apocalyptic kind. I was twenty-eight weeks pregnant with my third. Lily was at kindergarten. Noah was smashing Cheerios into the couch. And the Oregon DEQ was telling me the air was unhealthy for sensitive groups. Pregnant people were explicitly named.
I called my OB. I expected a generic "stay inside" answer. What I got was a fifteen-minute conversation that actually changed how I think about prenatal environmental exposure. She told me that PM2.5 particles from wildfire smoke are small enough to cross the placenta. Not in massive amounts, but enough that studies have linked high-exposure days to lower birth weights and preterm labor. She was not trying to scare me. She was trying to give me context.
Here is what she recommended. First, do not exercise outdoors when AQI is above 100. At 150, stay inside with windows closed. At 200, run a HEPA filter if you have one. If you do not have AC and it is too hot to keep windows closed, go somewhere else. A library. A mall. A friend's house. Heat stress plus smoke exposure is worse than either one alone.
I asked about N95 masks. She said they help for short outdoor exposure, but they are not perfect. The real problem is exertion. Walking slowly to your car is fine. Walking briskly for thirty minutes is not. Your breathing rate increases. You pull more air — and more particles — into your lungs. And during pregnancy, your lung capacity is already reduced by the uterus pushing up your diaphragm. You are working harder to breathe anyway. Adding smoke is genuinely unfair.
I also asked about my unborn baby's development. She said the third trimester is when fetal lung development accelerates. Exposure to high PM2.5 during this window has been associated with reduced lung function in childhood. Not guaranteed. Just associated. But why risk it when the solution is simply staying inside for a few days?
So that is what I did. I closed the windows. I turned on the box fan with a DIY filter taped to the back. I let Lily watch twice as much TV as usual. I ordered groceries for delivery instead of walking to New Seasons. I felt guilty about the screen time. I felt guilty about the delivery driver. But I did not feel guilty about protecting my baby's lungs.
By Thursday, the AQI dropped to 85. We went to the park. Lily ran. Noah ate dirt. I breathed deeply and felt grateful for clear air. Pregnancy is already a list of a thousand things to worry about. Adding wildfire smoke feels like a cruel joke. But the advice is simple: when the air is bad, be boring. Stay inside. Watch movies. Order takeout. The baby does not care about your step count. The baby cares about oxygen.
Emily Carter, Portland
