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In Memory Of
Helen Stuart August 19, 1926 - February 19, 2024
Lake Tahoe Dance Collective
Listed under: Art, Culture & Media
A smoky blanket of particulate matter hovers over San Francisco’s skyline. Photo by Steve Jurvetson CC BY 2.0
BY SABA RAHIMIAN
AQI, or the Air Quality Index, is explained as a “thermometer for air quality.” It ranges from zero to 500; as the number increases, so does the level of pollution in the air.
In the not-too-distant past, most Californians felt no need to check their local AQI unless they lived in a traffic-clogged, smog-choked metropolitan area.
But ever-worsening fire seasons and the attendant concentrations of smoke have resulted in wider usage of the acronym. Californians and many other Western United States residents, accustomed to beautiful blue skies, have become familiar with this air quality evaluation tool; they now look for the AQI number at the bottom of their smart phone’s weather application.
The Clean Air Act of 1970 was the first comprehensive federal law that regulated emissions. The act set the precedent for current air quality standards, regulated by the Environmental Protection Agency. Today, the AQI reflects the following compounds in our air: ground-level ozone, particulate pollution, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Most of our weather apps show words such as good, moderate, unhealthy for special groups, unhealthy, very unhealthy, and hazardous. You can also check the air quality in your neighborhood using the free online map provided by Purple Air, a privately held company which sells air quality sensors.
Nowadays it’s unnecessary to calculate the AQI and interpret the levels for ourselves. But individuals do need to understand what prolonged levels of exposure mean for their health.
During 2020—a record-setting year for wildfires—parts of California reached over 500 on the AQI meter from mid-August to mid-September, ranking the air quality hazardous.
According to an article by UC San Francisco News and Media, most healthy adults are able to recover from exposure to extreme smoke.
Long-term exposure, however, will continue to bombard the lungs with particulate matter. Though some individuals will only have symptoms of coughing or wheezing for a few weeks, anyone with a predisposition is likely to feel longer effects of this exposure. When PMs are inhaled they get lodged in the lungs as hydrocarbons, causing some short-term damage and inflammation. Dr. John Balmes of UCSF shared that the risk is threefold with more vulnerable populations, children or seniors with chronic ailments and or asthma: “Inflammation in the lungs can become systemic, affecting the whole body’s vascular function; the risk for blood clots increases, which can lead to heart attack or stroke; and the autonomic nervous system is stimulated, which can cause heart arrhythmia.” In addition, Balmes said, “There’s good evidence that these effects can accelerate atherosclerosis, the plaques that build up inside blood vessels.”
Climate change is leading to hotter and drier summers, and with them, the threat of wildfires. So if and when the fires start, it could be time to purchase high-quality air filters—or get out of Dodge until the particles disperse.
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