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Posts tagged ‘inversion’

Nov 10

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Inversion season is here! What can we do?

November 1 is the official start of inversion season along the Wasatch Front and it certainly feels like  winter is settling in around us!

But what exactly is an inversion? This natural phenomenon occurs when a high-pressure system is setting up, trapping cold air on the valley floors with warmer air above it. This warm air also traps all our pollution with the cold air, keeping it contained in the valley until the inversion breaks. 

What causes an inversion? 

Meteorologists on the news and the Utah Division of Air Quality will  warn you in advance before an inversion happens. Here are some signs that you can keep a look out for: 

  • Calm winds: this reduces the natural mixing of air temperatures. 
  • Clear skies: this increases the rate of cooling for air close to the ground. 
  • Long nights allow the cooling of the ground to continue over a longer period of time, resulting in a greater decrease in temperature near the surface. 
  • The sun is lower on the horizon during the winter, so it supplies less warmth to the earth’s surface and more to the atmosphere. 

In Utah, our inversions often occur right after snowstorms due to the increase in cold air near the ground and the clear skies warming up the upper atmosphere and acting as a lid to the cooler air below. 

Inversions are meteorological events that are common in mountain/valley geographies with our weather patterns.  When you pair inversions with human activity, you often wind up with pollution that sticks around.  Here along the Wasatch Front, a significant source of pollution comes from transportation(roughly 50%), as well as our homes and buildings (roughly 35%). That means each of us can make a difference to our air quality. 

What can you do? 

Read more

Jan 10

Introducing Salt Lake City’s Air Quality Action Day Program for Employees

We had an amazing December with lots of storms and snow that filled our mountains and gave kids around the neighborhood plenty of opportunities to build snowmen.

But this week the dreaded high pressure took hold and we’re looking at several days, if not a couple of weeks, of inversions. This means that whatever we emit into the air stays there. And pollution doubles every day. Yuck!

The National Weather Service predicts high pressure and poor air quality for the week of January 10.

This is the time for us all to prioritize ways to reduce our contribution to the haze.

It’s also a fitting time for Salt Lake City to launch a new air quality program.

As you’ll recall, Salt Lake City works hard to create programs, projects, and policies to improve air quality:

We passed one of the first anti-idling ordinances in the state; continue to prioritize electric vehicles for our fleet, as well as offer free charging at City-owned EV stations for the community; implemented a building benchmarking ordinance to measure and reduce emissions from our city’s largest commercial buildings; and just last month the RDA passed an aggressive new sustainability policy to significantly reduce air pollution from new building construction that receives RDA funding. (Learn more about Salt Lake City’s air quality efforts here).

We also aim to reduce emissions by implementing air-conscious internal policies with our 3,000-strong workforce.

And one of the ways we can do this is to encourage best practices within our workforce on days when the air quality is forecasted to be unhealthy.

This is the intention behind the Air Quality Action Day program which launched in December 2021 (and was debuted during our inversion this week).

Read more

Nov 19

Keeping the Air Clean this Winter

November marks the beginning of inversion season in the Salt Lake Valley. This is the time of year when pollutants including PM 2.5 get trapped in the valley, obscuring the mountains and posing dangerous health risks to our communities.

Protecting our airshed and reducing pollution wouldn’t be possible without the collective actions of everyone coming in and out of Salt Lake City. While transportation contributes a significant portion of the local air pollution, other factors including building efficiency and home energy use can also contribute to pollution. Studies have shown that air pollution disproportionately affects communities of color, partially as a result of source location and historical redlining of neighborhoods. Air quality continues to be a major equity concern for Salt Lake City, where proximity to major highways, industrial areas, and fewer trees make some parts of Salt Lake City more polluted than others. By addressing air pollution’s many sources, Salt Lake City can help improve air quality.

Keep reading to find out more about what you can do to help everyone breathe a little easier!

Photo of Salt Lake City from northern foothills on bad air day. Smog fills the valley and obscures the Oquirrh Mountains in the west.

How Can You Help Clean Up the Air?

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Feb 21

Ride the Bus, Clear the Air, Take the Survey!

Take the Frequent Network survey here!
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The Clear the Air Challenge is a little more than halfway over. This month, we’ve been inspired to see more of our friends and colleagues carpooling, walking, biking, and taking public transit to get around Salt Lake City.

Transportation emissions cause nearly 50% of the pollutants that become trapped in our airshed during inversions, so finding ways to get out of the car makes a difference!

That also why Salt Lake City continues to invest in programs that make using transit easier and more affordable for residents.

Have you heard of the Frequent Transit Network?

In 2018, the City passed a sales tax and bond initiative called Funding our Future, with the goal of increasing funding to support public safety, street repair, better transit service, and greater housing opportunities.

A robust transit system is the backbone of a thriving community. It also supports the city’s goal of curbing carbon emissions and clearing the air, so we are grateful that Salt Lake City voters supported it!

After significant public outreach, the first phase of the transit expansion began in August 2019.

Three east-west UTA bus routes were enhanced to provide more transit, for more people, with more convenience and reliability.

What does “Frequent Transit Network” mean?

Very simply, it means buses that run every 15 minutes during peak times, with early-morning, later-night, and Sunday service. That means you can rely on these lines to get you where you need to go, on your schedule.

Critically, these lines also offer key east-west connectivity, which is an enhancement to the Salt Lake City transportation network. These routes are the 2, 9, and 21 routes.

Graphic describing the Frequent Transit Network. Text reads "For the first time, Salt Lake City has launched a Frequent Transit Network. 200 South Route 2, 900 South Route 9, 2100 South Route 21." The graphic includes an illustration of a UTA bus.

Routes 2 (200 S), 9 (900 S), and 21 (2100 S) now provide: 

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Jan 23

Join the Clear the Air Challenge 2020

Are you ready for a new challenge? How about one that will help you save money, burn calories, and improve our air quality? Salt Lake City employees are already on board and want to invite you to join the 2020 Clear the Air Challenge. During the month of February, keep our air clear of pollutants by limiting your driving!

You can aim to reduce your “driving-alone” trips every day in February, or pick a goal that’s manageable for you. It all helps!

If you don’t have a team and want to challenge yourself, please join the Clear the Air Challenge SLCgreen Team!

What is the Clear the Air Challenge?

Since 2009, Utahns have been participating in the month-long Clear the Air Challenge. During February, when air quality in Utah is historically bad, participants track their trips with the goal of avoiding single-occupancy vehicle travel and reducing air pollution. Participants carpool, bike, walk, telecommute, trip chain, take public transit, drive electric vehicles, and ride electric bikes or scooters– all to help clear the air!

In 2019, participants in the Clear the Air Challenge eliminated 84,421 single-occupancy vehicle trips. This saved 1,244,624 miles of traveling and $0.4 Million! Together, all these efforts reduced 359.8 tons of CO2!

This year, the Clear the Air Challenge needs everyone’s help to reach the goal of eliminating 100,000 single-occupant trips.  

Clear the Air to Protect Our Health

Winters in Utah can be beautiful, but when inversion starts, polluted air gets caught in our valleys. PM 2.5 and other pollutants threaten our health the well-being of our communities.

On bad air days, our activity is limited. Moreover, children, older adults, and people with heart diseases or respiratory problems are at a higher risk for suffering from poorer health due to bad air. Poor air quality is associated with a range of negative impacts including pregnancy loss, premature death, child asthma, and increased cases of pneumonia.

In Salt Lake City, nearly 50% of air pollution comes from cars, trucks, and other vehicles. That’s why the Clear the Air Challenge is more important than ever.

We love it when the air is clear!

What We’re Doing

Salt Lake City Corporation employees are already signing up to do their part to Clear the Air this year (see our previous Challenge roundup).

Each participating department has its own team. Salt Lake City employees live all over the Wasatch Front. Many of us take public transit to work every day. Others carpool or bike. For the month of February, we’re doing all we can to cut back on our single occupancy car rides!

Salt Lake City departments compete with each other for the coveted Clear the Air Challenge “Mayor’s Cup” and “SLCgreen Team Spirit” award.
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Thanks to the recent public transit expansions, the robust network of bike paths for the sunny days, as well as the Clear the Air Challenge app’s handy carpool guide, the Clear the Air Challenge will make February an exciting and competitive month!

Join SLCgreen’s Clear the Air Challenge Team

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Dec 5

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We've Got the December Bad Air Blues

The view from the SLCgreen office on Dec. 4, 2019.

With a week of air that has been some of the worst in the country, it’s no wonder we’re all feeling frustrated. Salt Lake City’s current air quality is unhealthy for sensitive groups and requires mandatory action of limited driving and no wood burning. For most of us, Salt Lake City’s notoriously bad air is a nuisance and health concern, limiting our activities and turning our skyline grey. Moreover, pollutants like PM 2.5 are dangerous, especially for older residents, children, pregnant women, and people with respiratory and cardiovascular conditions. Air quality is a public health concern, as well as an economic one.

It may come as a surprise that although transportation currently contributes nearly half of the emissions causing Salt Lake City’s bad air, buildings are catching up. Indeed, houses and buildings currently contribute roughly 38% of emissions, and industry point sources produce the other 13%. As emissions standards on cars are becoming more strict, managing emissions from houses and buildings is a growing priority.

PM 2.5 is the primary winter concern in Salt Lake City’s airshed. The particulate matter poses serious health risks and gets trapped in the Salt Lake valley during inversion. Most of the PM 2.5 is a direct result of precursor emissions from tailpipes, smokestacks, and chemicals that mix to form PM 2.5 in the atmosphere.

When you look outside, it may feel like there’s no good news. However, per capita pollution in Utah is decreasing. Salt Lake City is taking steps to help clean the air and protect our public health and environment. Find out how you can keep our airshed (and lungs!) clean and healthy.

What is SLC doing?

Reducing combustion and emissions are a key step towards cleaning the air.

Salt Lake City has many air quality initiatives in place that are helping clean the air. Among these include the continued expansion of EV infrastructure, expanding cleaner vehicles in our fleet, and implementing our energy benchmarking ordinance for nearly 1,000 commercial buildings. Additionally, the HIVE pass provides residents with access to UTA’s public transit system at a reduced cost.

Salt Lake City built the nation’s first Net Zero energy Public Safety Building.
In 2018, Salt Lake City converted five parking enforcement vehicles to all-electric Chevy Bolts. As of Oct. 2019, the Salt Lake City fleet has over 135 hybrids, 32 all-electric vehicles, 72 compressed natural gas heavy duty vehicles, and 117 clean diesel heavy duty vehicles.

Read more

Dec 14

Concerned about Air Quality? Take Advantage of Clean Transportation Options

It’s only mid-December but we’ve already had a few inversions– and the dirty air they trap– this season.

Luckily this week’s winter storm has cleared out the inversion and the worst of the poor air, but it’s a reminder of why it’s all the more important to be mindful of how we can each reduce our contribution to the muck.

Because transportation accounts for 48% of the air pollution we see on any given wintertime inversion day, choosing cleaner ways to get around is one of the most impactful steps we as individuals can take

With that in mind, we’d like to share a couple of exciting options that are available right now to promote more sustainable travel.  

Hive Pass Discounts

Salt Lake City residents can apply for the HIVE pass. The Salt Lake City program, in partnership with UTA, offers easier access to mass transit by reducing the cost of the monthly adult pass by 50%.

Read more

Jan 18

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Help Clear the Air! Sign up for the February Challenge

Clear

Transportation emissions are responsible for nearly 50% of the pollutants that make up our poor air quality. These pollutants become a serious concern during the winter months when normal atmospheric conditions (cool air above, warm air below) become inverted. This allows the air quality in the valley to become filled with particles that can quickly become unhealthy.

While there is much work being done to reduce those emissions (better transit, cleaner vehicles, more active transportation), the fact is– we can and should all help. We can each be a #CleanAirChampion.

There are many ways to participate! They all help the air and give you points in the Challenge:

  • Ride the bus or train
  • Bike or walk to work
  • Link your errands together when you are driving (aka “trip chain”)
  • Skip the trip by working from home or saving that errand for later

It all adds up!

PM25_sources-01

The Utah Division of Air Quality estimates that if every driver along the Wasatch Front were to give up driving for just one day per week, it would keep 6,500 tons of emissions (or 85 times the weight of the International Space Station) out of our airshed.

Read more

Dec 11

Avoid the Cold Start

We’re in the midst of a yucky inversion. At one point on Monday, the amount of particulate pollution crossed the 55.5 microgram/cubic meter threshold, which puts us in the red category of “Unhealthy” territory.

Dec 11 Air Quality

Air quality conditions and forecasts are available at http://air.utah.gov

Unfortunately, our weather patterns and geography mean we have to work extra hard to reduce what goes into the air.

One of the simplest things you can do is to leave the car at home.

Did you know that the majority of pollution comes when you simply turn your car on?

It’s the phenomenon of “Cold Starts.”

It means that 60-90% of your commute’s emissions come in the first three minutes. Pretty incredible, huh?

You can learn more about cold starts from UCAIR’s great blog post and video below.

So what can you do? Well, aim to keep your car parked as frequently as possible — even if it’s just for a day, or a single trip you’re skipping

Cold-Starts

How to avoid the Cold Start: Read more

Dec 7

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Green Holiday Guide

Adobe Spark (8)

SLCgreen’s “Green Holiday Guide.” It’s snow bunny approved.

 

During the holiday rush, sustainability may not be the first thing on your mind. Fortunately, there are a number of measures you can take to ensure your festivities are more eco-friendly and sustainable.

We’ve compiled these actions into a convenient Green Holiday Guide. No matter how you celebrate, we at SLCgreen hope you find this information helpful and wish you the best of times and a very happy New Year!

Christmas Trees

One great option for your home Christmas tree is a live native potted tree. When you’re done with it, plant it after the holidays or let it live on as a house plant. As an added bonus, a live tree will absorb carbon dioxide and breathe out oxygen for cleaner air.

Check with your local nursery or garden center for advice on the best type of tree, depending if you are planning to replant or keep it inside.  If you can, hold off and plant it in late March or early April. This will increase the tree’s chance of surviving long term.

If you go for a cut tree, use the compost bin to dispose of it after the holidays. Make sure to cut it up so it fits in the bin and remove any tinsel or non-organic decorations (Just be sure to dispose of it before the wintertime suspension of compost bin collection, beginning the week of January 22, 2018).

If you can’t cut up your tree for the compost bin, no problem. Leave it curbside and we’ll be by during the month of January to collect it.

No matter what you do, do not burn your tree. Burning anything during the winter is horrible for our air quality (Burning during “air action” days is also against State regulation and violates Salt Lake County Health Department rules).

Energy efficiency

When stringing up lights this season, think “less is more.” For the lights you do put up, go for LED lights, which are 80-95% more efficient than traditional bulbs and will last longer. (This is a good reminder to switch out any other traditional light bulbs you may have in your home for LEDs too!)

Y_Christmas_Tree_2

LED lights look great on me!

Make sure you have your lights on a timer so they only are on when you want them to be. Some LED Christmas lights are even solar powered! Read more

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