Boise Babies: City Haze Blocking Summer D?

By Franklin Everett Shaw

March 9, 2026

The air in Boise hangs heavy, not just with the promise of summer, but often with the acrid bite of wildfire smoke. It’s a reality we’ve grown accustomed to, but one that carries hidden health implications, especially when it comes to something as vital as Vitamin D. We often think of sunshine as a constant in the summer, but what happens when that sunshine is filtered, blocked, or simply avoided due to unhealthy air quality? The answer, unfortunately, is a potential Vitamin D deficiency, and it’s a problem Boiseans need to address proactively.

Vitamin D, often called the “sunshine vitamin,” is crucial for bone health, immune function, and even mood regulation. Our bodies produce it when our skin is exposed to UVB rays from the sun. But wildfire smoke, increasingly prevalent in Boise summers, acts as a significant barrier, reducing UVB penetration and hindering Vitamin D synthesis.

The challenge is compounded by the fact that many Boise residents, like people everywhere, spend a significant amount of time indoors, further limiting sun exposure. Add to that the understandable desire to avoid the outdoors altogether when air quality is poor, and you have a perfect storm for Vitamin D deficiency.

So, what can Boise residents do to combat this smoky season Vitamin D deficit? It’s a multi-pronged approach involving diet, strategic sun exposure, and supplementation.

First, let’s talk about diet. While it’s difficult to get all the Vitamin D you need from food alone, incorporating Vitamin D-rich foods into your diet can certainly help.

• Fatty fish: Salmon, tuna, and mackerel are excellent sources. Look for wild-caught salmon at local stores like Whole Foods or Trader Joe’s for a higher Vitamin D content.
• Egg yolks: While the amount of Vitamin D varies, eggs are a readily available source. Opt for eggs from pasture-raised chickens, as they tend to have higher levels. You can find these at the Boise Co-op or farmers’ markets.
• Fortified foods: Milk, yogurt, and some cereals are often fortified with Vitamin D. Check the labels at your local grocery store.

However, relying solely on diet is often insufficient, especially during periods of heavy smoke. This is where strategic sun exposure comes in.

The key is to maximize your sun exposure during periods of clearer air. This requires paying attention to air quality reports and taking advantage of those precious moments when the smoke clears.

• Check the Air Quality Index (AQI): Use resources like AirNow.gov or the Idaho Department of Environmental Quality website to monitor air quality in your area. Aim for sun exposure when the AQI is below 50 (Good) or at least below 100 (Moderate).
• Time of day: UVB rays are strongest between 10 am and 2 pm. Even a short 15-20 minute exposure during this time can be beneficial.
• Expose more skin: The more skin you expose, the more Vitamin D your body will produce. However, always be mindful of sunburn and protect your skin accordingly when the AQI is higher.
• Location matters: Even within Boise, air quality can vary. Consider heading to areas less affected by smoke, such as the foothills or areas further away from major roadways.

But what if clear air is scarce, as is often the case during Boise summers? This is where Vitamin D supplementation becomes crucial.

Choosing the right Vitamin D supplement can be overwhelming, but here are some key considerations:

• Vitamin D3 (cholecalciferol): This is the preferred form, as it’s more effective at raising Vitamin D levels in the blood compared to Vitamin D2 (ergocalciferol).
• Dosage: The recommended daily allowance (RDA) for Vitamin D is 600 IU (International Units) for adults, but many experts recommend higher doses, especially for those with limited sun exposure. Consider starting with 2000-5000 IU per day, but it’s always best to consult with your doctor to determine the appropriate dosage for your individual needs.
• Third-party testing: Look for supplements that have been tested by a third-party organization like USP, NSF International, or ConsumerLab.com to ensure quality and accuracy of labeling.
• Form: Vitamin D supplements are available in various forms, including capsules, tablets, liquids, and gummies. Choose the form that you find easiest to take consistently.

You can find a wide variety of Vitamin D supplements at local pharmacies like Walgreens and CVS, as well as health food stores like Natural Grocers and Boise Co-op. Online retailers like Amazon also offer a vast selection.

Now, let’s address a common pitfall: assuming you’re getting enough Vitamin D without actually knowing your levels. The only way to truly know your Vitamin D status is through a blood test.

Several options are available in Boise for Vitamin D testing:

• Your doctor: The most reliable way is to ask your primary care physician to order a Vitamin D blood test (25-hydroxyvitamin D). This is usually covered by insurance.
• Direct-to-consumer testing: Companies like Everlywell and LetsGetChecked offer at-home Vitamin D test kits that you can purchase online. These can be a convenient option, but be sure to choose a reputable company and follow the instructions carefully.
• Local labs: Some local labs, like St. Luke’s and Saint Alphonsus, may offer Vitamin D testing without a doctor’s order, but you’ll likely have to pay out-of-pocket.

Once you have your Vitamin D levels, you can work with your doctor or a registered dietitian to develop a personalized plan to optimize your levels.

Here’s a crucial point: Vitamin D is fat-soluble, meaning it’s best absorbed when taken with a meal containing fat. So, take your supplement with breakfast, lunch, or dinner.

Another common mistake is inconsistent supplementation. It’s not enough to take Vitamin D sporadically. Consistency is key to maintaining optimal levels. Set a reminder on your phone or incorporate it into your daily routine.

Finally, remember that Vitamin D is just one piece of the puzzle when it comes to overall health. A balanced diet, regular exercise, and adequate sleep are also essential.

Boise’s smoky summers present a unique challenge to maintaining adequate Vitamin D levels. But by being proactive and implementing these strategies, Boise residents can protect their health and thrive, even when the air quality is less than ideal. Don’t let the smoke steal your sunshine – take control of your Vitamin D levels today.