air pollution

Air Quality and Coronavirus: What do we know so far?

April 8, 2020 by Katherine Baker Leave a Comment

Welcome to another coronavirus post. Now, I know I said I wouldn’t dwell on the topic and go back to business-as-usual science based posts, but to be honest, covering other topics interests me less than it would otherwise, considering COVID-19 is impacting our daily lives in significant ways. And of course, my public health brain can’t help but find fascination in reading the emerging science about it as it comes out. Today, I thought I’d focus on coronavirus and air quality. Like with my post on coronavirus and food safety, I’m going to focus on synthesizing what we know so far; considering COVID-19 is a novel disease, we are still learning about it and trying to understand it fully.

This post will cover two topics: first, we’ll discuss what we know so far about coronavirus and air quality, and how and why the disease may be impacting air quality. Second, given that many of us are spending most of our time indoors, we’ll chat about indoor air quality in general, and what you can do to improve the air quality in your living space.

If you’d like to learn more about COVID-19, please visit the WHO website, or feel free to visit any of my posts about it thus far below:

I plan to revisit this post once a bit more pollutant raw data is available, and am considering even running a mini analysis on my own. I am also working on a post about what increases risk of and transmission of zoonotic diseases. Stay tuned!

Are lockdowns and quarantines due to COVID-19 decreasing levels of air pollution?

News reports from around the world seem to indicate that yes, the slowdown in manufacturing and drastic decrease in transportation are decreasing levels of some pollutants.

Considering combustion emissions from vehicles are a major source of many pollutants including PM2.5 (read more about what PM 2.5 is here) and CO2, it is feasible that emission of some pollutants has decreased, given that travel has decreased and far fewer people are commuting to work or social events.

Additionally, when you consider the abrupt halt in many industrial manufacturing processes that has also occurred over the past few months, a decrease in levels of some pollutants seems feasible, as well.

However, while many media outlets have reported these decreases in air pollution across parts of Europe and in some cities in the US based on satellite data, peer-reviewed literature on the topic has been sparse.

Now, this does not mean these reports are untrue; in fact, it’s likely that they are. I just wish there was a bit more peer-reviewed literature published on the topic so I could feel more confident in synthesizing an interpretation on the matter.

I was able to find one assessment of pollution levels in China pre and post-lockdown, which found that carbon emissions dropped 25% as a result of the swift halt in industrialized activities. And a NASA report found NO2 (another pollutant) dropped 30% between January 1 – February 24, 2020.

But the NASA scientists note that this drop in pollution doesn’t necessarily mean the air quality is ‘good’ or healthy across China. Air pollution is still a major issue, even if we see what is inevitably a temporary decrease in emission levels.

A scientist at Columbia has also stated that pollution levels at her monitoring station in the city have dropped in recent weeks compared to pre-shelter-in-place levels.

Like the media reports mentioned above, these results aren’t peer-reviewed or published in any journal. In fact, I couldn’t find any peer-reviewed journal articles about air pollution levels in Europe or the United States pre and post COVID-19.

Upon some reflection, this is likely because it is a bit early to take a measurement that would span a long enough time period to be meaningful to show us what, if any, potential decreases in emissions are occuring, and if they are lasting.

Most air pollution and climate experts warn, however, that even if there is a decrease in emissions now, it is likely temporary, and not necessarily worthy of celebrations. Even if we did decrease carbon emissions by, say, 30%, the emissions levels would still be higher than they were a decade ago.

Additionally, the Trump administration issued a memorandum on March 26, 2020 that informed companies that the EPA would not be subject to fines or other legal enforcements for failing to monitor and report their levels of air, water, and soil pollution, citing the COVID-19 outbreak as the reason for the relaxation of pollution regulation enforcement.

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Air Pollution and Human Health: How Poor Air Quality Leads to Chronic Illness and Death

November 7, 2019 by Katherine Baker 1 Comment

The current air quality emergency in Delhi, where the AQI has reached 999 (which is well above the “safe” level of 100 set in the US by the EPA), has raised recent awareness about air pollution and human health.

I recently shared some articles on the #DehliAirEmergency on my social feeds, adding a comment about how air pollution caused over 8 million deaths per year. Several people reached out to me, surprised that air pollution could cause death or chronic illness, and so I thought I’d devote a post to address the health impacts of air pollution.

I must say I myself was shocked to learn about the serious and sweeping dangers of air pollution. I always assumed it could cause some respiratory distress, but didn’t think it could do much more than that.

Then, I took a job where I spent a semester researching air pollution as a justice issue for a lawyer at Mailman (she’s a legend and I learned so much…but that’s another story for another time) and I was surprised to learn it caused not only respiratory illness, but also cardiovascular diseases, cancer, neurological illnesses, and even death.

What’s alarming about air pollution, and many other environmental health exposures, is that they are, for many, unavoidable. While we can choose whether or not we smoke, do drugs, or engage in other risky health behaviors, we must all breathe air, we do not have the luxury of choosing how clean or dirty that air is.

Obviously, air pollution levels vary by geographical location, and there are luxuries afforded to privileged individuals to reduce their risks. However, air pollution, like climate change, is a threat to us all.

I hope by spreading awareness about these topics I can help others understand how and why we need to take action. I don’t think anyone wants their family, friends, and pets breathing in toxic air, because as you will learn in the text that proceeds this, air pollution can do a lot of damage to health.

So with all that said, here’s a post about how air pollution can impact human health. I hope you enjoy it As always, please feel free to leave questions or comments below, and/or reach out to me on Instagram, Twitter, or YouTube!

What is air pollution?

Air pollution is a mixture of natural and human-created substances in the air. According to the WHO, the 6 major air pollutants include ground-level ozone, particle pollution (read all about PM 2.5 here), carbon monoxide, sulfur oxide, nitrogen oxides and lead.

Air pollutants are typically divided into two main categories: outdoor air pollution, and indoor (ambient) air pollution.

Outdoor air pollution is, as the name suggests, pollution you would be exposed to the outside of the built environment, and includes things like fine particles produced by the burning of fossil fuels, ground-level ozone (which is produced from the reaction of oxygen and urban smog), tobacco smoke, and noxious gasses such as sulfur dioxide, nitrogen oxides, carbon monoxide, and chemical vapors.

Indoor air pollution (also known as ambient or household air pollution) is found within buildings and homes and is considered one of the most important environmental health risks worldwide.

Indoor air pollution involves exposure to household particles like building materials such as asbestos, formaldehyde, and lead, allergens from pests like cockroaches and mice, tobacco smoke, mold, and pollen. Indoor air pollution may also contain carbon monoxide, radon, and household products and chemicals found from cleaning, building, or pest control products.

In developing countries, indoor air pollution is often generated by incomplete combustion of fuels for cooking, heat, and lighting, without ventilation. Coal, charcoal, wood, kerosene, and dung are commonly burned using ‘dirty’ technologies, which do not completely burn these fuels, and emit air pollution into the home. People who spend more time around the source of the air pollution, like women and children, are at highest risk for adverse health effects.

Both forms of air pollution are important to address and both can contribute to each other.

Air Pollution and Human Health: How many people die each year from air pollution?

Air pollution is responsible for an estimated 8 million deaths each year (some estimates go up to 8.8 million deaths per year), with about 4 million of those deaths coming from indoor air pollution.

Yes, you read that correctly – over 8 million people die from air pollution each year.

To put that in perspective, the WHO estimates 7 million smokers die each year from cigarettes (and an additional 1.2 million die from secondhand smoke), meaning deaths from air pollution are roughly on par with deaths from smoking. Except individuals have the choice to smoke. AIr pollution is something people can’t escape.

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What does it mean when your phone says “Unhealthy Air Quality for Sensitive Groups?”

July 20, 2019 by Katherine Baker 2 Comments

Ever look down at the weather app on your iphone and see some small text under the temperature that reads “Unhealthy Air Quality for Sensitive Groups?” Ever wonder what that means? And if you should be concerned?

Today we are going to be discussing exactly what that unhealthy air quality for sensitive groups warning means, and what you can and should do when you see it.

While this blog has been heavily nutrition-focused lately, but this post is going to tap into my Environmental Health Science MPH. May as well use it, right?

What is AQI?

Before we can understand what “Unhealthy Air Quality” means, let’s first talk about what it is and how it’s measured. Air Quality Index (AQI) is a term used by government agencies to communicate with the public how polluted the air is or is forecasted to be.

Generally speaking, the higher the AQI, the greater the public health risk. Different governments have different national air quality standards to classify different health risks and communicate these risks to their citizens.

How is the AQI Calculated?

In the US, the EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act, including particulate matter (read my whole post about what PM is here), carbon monoxide, ground-level ozone, sulfur dioxide, and nitrogen dioxide.

Air monitors collect and record pollutants over 1,000 locations across the country. The raw data is used to develop a separate AQI for each of the 5 mentioned pollutants. The highest of the AQI values from these 5 is reported as the AQI value of the day.

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