Tuleyome's Science Corner: Getting Accurate Air Quality Information

Kristie Ehrhardt • June 7, 2022

The Air Quality Index (AQI) is a color and number value assigned to the current level of air pollution, the higher the number the worse the air quality is. The AQI is easy to interpret with number values ranging from 0 to 500 and the colors progressing from green (healthy, 0-50), yellow (moderate, 51-100), orange (unhealthy for sensitive groups, 101-150), red (unhealthy for everyone 151-200), purple (very unhealthy, 201-300) to dark purple (hazardous, 301-500). The objective of the AQI is to help you understand what the current air situation is and how it affects your health. Knowing the AQI for your immediate area helps you decide if it’s safe to go for a run outside or if maybe you should work out at the gym that day. But, where do you look for reliable air quality information? Most people I know head straight to their smart phones but simply opening the weather app isn’t giving you true, accurate air quality data for your area. Below are several resources to help you understand your current air quality situation and what you can do to avoid impacts to your health.


If you want to know the current air quality data for the Sacramento region, check out Spare the Air.  They have a free app which makes it just as easy as checking the weather app on your smart phone but the data is recalculated hourly from monitors all through the region to provide the most current information for your specific area. You will also get a Spare the Air alert when the AQI is forecast to reach 126 or above for the Sacramento region.


To get reliable forecast information for Yolo County, check out Enviroflash. Enviroflash is provided by local, state and federal environmental agencies and offers suggested safety measures for current and forecasted bad air quality. The information provided by Enviroflash is the same information that is provided to local news agencies but you can receive a tweet or an email from them before even turning on the television or radio. You can select the AQI level that you’d like to be notified at; for someone who is particularly sensitive to bad air quality, you may wish to receive notifications at a lower AQI. Visit the website to sign up for forecast notifications.


During a wildfire or other smoke event visit AirNowThis site uses data collected from a network of monitors and sensors placed all over the region. Some of them are temporary sensors that were placed during a smoke event to get additional data and some of them are permanent sensors or monitors that collect information year-round. The data from all of these sensors is shared, combined and corrected to provide accurate air quality information for that specific area. You can look at the map and choose specific sensors to look at as well as large fire incidents, satellite fire detections and smoke plumes.


Having reliable air quality information can help you adjust your activities, remember, even healthy people can be affected by poor air quality. If you can smell smoke, you’re breathing smoke.


-Kristie Ehrhardt; kehrhardt@tuleyome.org


Tuleyome Land Conservation Program Manager

RECENT ARTICLES

By Ellen Jenkins July 2, 2026
From left to right, Horticulture Interns Ellen Jenkins, Rithika Warrier, and Diego Barraza Hernandez, with Education Associate Geoff Benn, who coordinates the internship program. From September to June, I worked as a Horticultural Intern at Tuleyome. Each week at the Woodland Regional Park Preserve, I would meet with my mentor Teri Barry. Over the course of the year, we worked together identifying, documenting, and analyzing the preserve's growth. Through this opportunity, I gained experience in hands-on restoration efforts, familiarity with plant taxonomy and classification, and community outreach.
By Kristie Ehrhardt July 2, 2026
I’m sure you already know that the Bald Eagle is used as a symbol of our Nation’s freedom, strength, perseverance and independence. It is said that our founding fathers chose the Bald Eagle to adorn our Great Seal because it is indigenous to North America and if you look closely at it, you’ll see that it is holding 13 arrows and an olive branch simultaneously symbolizing the power of war and the power of peace. But, what about our national mammal? Er, maybe you didn’t even realize that we had a national mammal… President Barack Obama designated the American Bison as our national mammal in May of 2016. It too is endemic to North America and in prehistoric times, millions of them roamed through roughly two-thirds of the United States. Their range was known as the “great bison belt” - a stretch of habitat that encompassed the forests of Alaska, the grasslands of the North American plains and stretched from the Great Basin east to the eastern Appalachian Mountains. Side note - I’m just gonna come clean right now and tell you that the historic range of the American bison, American Buffalo or just plain bison or buffalo does NOT include the Berryessa Snow Mountain National Monument (Monument). I’m supposed to be writing about the Monument region and I picked a topic that is clearly not there but it’s important and they are impressive so please don’t tattle. Another side note - the American Bison and the American Buffalo are one in the same and both names can be used interchangeably. Its scientific name (genus and species) is actually Bison bison so I guess calling them bison is probably more scientifically accurate but either works. Bison are North America’s largest land animal; an adult male averages about 2,000 pounds - that’s a ton (thanks Schoolhouse Rock, I will never forget this one!), are about 12 feet long from nose to rump and about six feet tall. Females max out at around 1,000 pounds and are a little over nine feet long. In the wild bison can live ten to twenty years. Both females and males have massive forequarters and sport what looks like a shaggy, long-sleeved sweater. Both sexes have short, curved horns that are an integral part of their status in the herd and defensive strategy. During the snowy winters, bison display a dark brown winter coat and in the summer they show off their lighter brown summer-bods. Calves typically arrive from March through May depending on weather conditions. When they’re first born calves are an orangey-red color which earned them the nickname “red dogs”. Within a few months they become darker brown like their parents and their little horns start to poke through. Around this time they also begin to develop their iconic shoulder hump. The hump is made of solid muscle buttressed by elongated vertebrae. This dense network of muscles act as a powerhouse that allows the animal to swing its massive head from side to side and plow through icy snow to access buried forage enabling them to survive even the harshest winters. Although they are not known for keen eyesight, bison have superb senses of hearing and smell. As monumental (get it?) as these animals are, they are shockingly quick and agile. Bison have been clocked at running 35 miles per hour (!), they can spin and turn on a dime, leap over high fences and are incredibly adept swimmers. All these mad skills on a strictly vegetarian diet - that’s ruminant efficiency. For thousands of years, before the European settlers arrived, Native Americans of all tribes and regions revered the bison. They were the cultural, spiritual and resource backbone of indigenous societies across the United States. Every part of the animal was used; the meat was consumed, the hide was used for clothing, shoes and shelters, and the bones and hooves were used for tools and weapons. Even the sinew was used for sewing and bow strings. Everything was copacetic then came the Europeans with their domestic cattle diseases and thoughtless greed. Bison were hunted to near extinction within roughly just 100 years. Their numbers went from an estimated 60 million (!) to less than 550 individual animals by 1889. They were hunted mercilessly and their habitat destroyed, some say as a way to control the Native Americans by removing their primary resource. One of the buffalo’s biggest fans was President Teddy Roosevelt. In the early 1880’s he traveled to what is now North Dakota (shout out to my people!) to hunt. After recognizing the bison’s diminishing population numbers he co-founded the American Bison Society in 1905 to help conserve and protect this American emblem. For many years the few buffalo that remained were only found in national parks and preserves but primarily on Native American reservations. Had it not been for the willingness of tribes across the country to work with interested individuals and state and federal governments, the American Bison would be gone today. Much like the Bald Eagle, the bison is an authentic symbol of American character and as it turns out, another one of the greatest conservation success stories in U.S. history. The bison within the Yellowstone National Park boundaries are direct descendants of the original animals that roamed our country’s grasslands and are the only herd that still occupy their original prehistoric location. This free-ranging herd numbers approximately 5,500 animals and is the largest herd on public land. Recovery efforts paid off and today bison can be found in all 50 states including private and tribal lands, national parks and wildlife refuges.