researchers mengyao li, susana ferreria, and travis smith examined data between 1993 and 2010 on temperature and on self-reported mental health obtained from a state based health survey system under the center for disease control and prevention. cooler days were found to reduce the probability of reporting bad mental health days whereas hotter days, mostly after ten consecutive days, increased this probability. the probability of frequent mental distress (more than 14 days of bad mental health for the past month) was even higher during these hotter days. 

three years prior to these findings, a study published in environmental health perspectives concluded that exposure to air pollution was also related to poor mental health. long-term exposure to particulate matter (pm 2.5) was associated with depression and anxiety, and short-term exposure to pm 2.5 was associated with suicide. pm 2.5 are fine inhalable particles that can be emitted directly from sources, such as construction sites and unpaved roads, or through complex chemical reactions of pollutants emitted from power plants and automobiles. 

the release of new research on temperature and mental health is a concerning addition to the psychological health effects humans could face from air pollution. understanding these implications, li and the other researchers suggested future studies examine how community-level factors impact the mental effects of climate change. 

“i think it’s necessary to know how community-level factors like neighborhood environment, social cohesion, and also individual adaptation actions like use of air conditioning or migration, whether those things would help mitigate the effect of temperature on individual mental health,” li said. 

at local levels, air pollution is often worse in lower income areas, where industrial facilities or highways serve as point sources, increasing exposure. speaking on both temperature and air pollution, li said, “the two factors combined together would pose extra pressure on people that have more exposure in those communities.”

as poorer and less developed communities will ultimately bear the mental burdens of increased air pollution combined with hotter days, it is clear that climate change is not the great equalizer. this health disparity will grow as increased temperatures will only exacerbate the mental health decline of exposed communities. 

at a local level, air pollution varies throughout the district of columbia and is generally higher in the seventh and eight wards which are historically low-income and often minority neighborhoods. this inequality is left unaddressed because the environmental protection agency aggregates air quality data from their six high-cost monitoring stations, labeling the district with the same pollution levels despite drastic differences between communities.

fresh air d.c., a student-run and community focused research project about air quality at george washington university, seeks to create the first and only community level network of low-cost air quality monitors. these monitors would serve to fill the gaps in pollution level data throughout the district’s wards. aitana mendiguren, a student working on community outreach for the project, said, “we mainly want to educate and empower community members of wards seven and eight who are exposed to higher local levels of air pollution. using our sensors they will be able to actually monitor their community-levels with real data.”

while fresh air d.c. stresses the physical health effects of air pollution, the recently discovered associations between mental health and global warming only further support the necessity for their efforts. “people living in these wards need the hands-on tools to understand how their health is a risk,” mediguren said. 

at harvard university’s t.h. chan school of public health, researchers analyzed data on pm 2.5 levels and covid-19 deaths. this extensive information came from 3,000 u.s. counties, including up to 98% of the u.s. population, and covered data through april 4. researchers found a 15% higher covid-19 death rate in counties that averaged one microgram per cubic meter more of pm 2.5 in the air.

as the world faces a respiratory virus, it is important to understand that our lungs might not be as strong as we think.

fine particulate matter are tiny chemical particles or droplets in the air that are two and one-half micrometers or less in width. human visibility is limited to particles larger than 40 micrometers. this matter exists in materials like organic dust, airborne bacteria, construction dust, and coal particles from power plants. 

when inhaled, particulate matter carries toxic chemicals into the respiratory tract, and accumulates in the lungs while also damaging other parts of the body, according to a 2016 study published in the journal of thoracic disease.

kelly jones, a registered nurse with a doctorate in nursing science, is an expert at the national socio-environmental synthesis center researching the effects of neighborhood conditions related to health outcomes. she describes the human lungs as branch-like structures with built-in mechanisms to keep out foreign invaders. the larger particles are subjected to our bodies’ natural defenses such as coughing and sneezing.

meanwhile, “these tiny tiny little particles, especially the 2.5 particles, make it all the way down into the lungs, lining the tissue and blocking the ability for gas exchange and lung movement,” jones said. ultrafine particles, 0.1 micrometer or less, can mimic oxygen molecules, entering into our bloodstream. the chemical reactive compounds found in ultrafine particles then impair the contraction of blood vessels causing clotting.

outside of cities, large amounts of fine particulate matter exist in certain desert conditions such as the sahara. “as far as man-made particles that we could actually control, definitely in urban spaces in more densely populated areas, there’s going to be more particulate matter overall. but with the exception that there are some natural systems where there is also fine matter,” said jones.  

it’s especially hard to imagine your lungs being coated with fine grains of sand in the sahara desert.  

beth gardiner, journalist and the author of the book “choked: life and breath in the age of air pollution” said, “we know that air pollution is contributing to greatly increased rates of a whole long list of health problems from heart attacks and strokes to all kinds of respiratory problems, many types of cancer, dementia, alzheimer’s, parkinson’s disease, diabetes, the list just goes on and on.”

the harvard paper estimated if manhattan lowered its average particulate matter levels by only one microgram per cubic meter over the past 20 years, the area would likely have had 248 fewer outbreak deaths by early april. the researchers of the study wrote, “results underscore the importance of continuing to enforce existing air pollution regulations to protect human health both during and after the covid-19 crisis.”

a later study published in the journal science of the total environment examined the relationship between long-term exposure to nitrogen dioxide, a chemical found in pm 2.5, and coronavirus fatalities. mapping the distribution of nitrogen dioxide across regions in italy, spain, france, and germany, scientist yaron ogden compared pollution levels to regional covid-19 mortalities. ogden’s results indicated that 78% of coronavirus fatalities were located in the five regions with the highest nitrogen dioxide concentrations. 

supporting harvard’s findings, this research stated, “long-term exposure to this pollutant may be one of the most important contributors to fatality caused by the covid-19 virus in these regions and maybe across the whole world.”

the center for disease control and prevention released new data on racial disparities in coronavirus deaths noting much higher mortalities in black communities compared to states as a whole. at local levels, air pollution is often worse in lower-income areas, where industrial facilities or highways serve as point sources, increasing exposure. 

“it’s quite likely that air pollution exposure plays a role,” gardiner said, “because we know that because of structural racism, environmental racism, and the way pollution facilities get cited, and housing systems work, we know that african americans are exposed to much higher levels of air pollution than white americans.”