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About Avoid Pollution. Breathe Oxygen. in Borabanda, Hyderabad
Air pollution is caused mainly by Transportation, fuel combustion in stationary sources, burning of fossil fuels like coal, wood, dry grass, and construction activity. Motor vehicles produce high levels of Carbon Monoxide (CO) and Hydrocarbons (HC) and Nitrogen Oxides (NO). Construction activities, bad roads and burning of fossil fuels are responsible for Dust (particulate matter) Pollution. Residential and Commercial activities also contribute to Air Pollution.What are the effects of Air Pollution ?
The human health affects due to poor Air Quality. Principally, air pollution affects the body's respiratory system and the cardiovascular system. Though the individual reactions to air pollutants depend on the type of pollutant a person is exposed to, the degree of exposure. Air pollution may cause long term health problems. The health effects caused by air pollutants may range from biochemical and physiological changes like difficulty in breathing, wheezing, coughing and aggravation of existing respiratory and cardiac conditions.
Do Pollution Masks Really Work?
Do pollution masks actually help to protect you? This winter has already seen harsh pollution spikes first in Harbin, and recently in Shanghai and eastern China. By coincidence I had been taking the train from Shanghai to Beijing during one of those days, and I sat mesmerized as we barreled through endless vistas of ghostly cities disappearing into the shroud.
Double Protected -- Totobobo mask and bike helmet
Double Protected — Totobobo mask and bike helmet
Such events, along with Beijing’s own “airpocalypse” last January, have dramatically increased public awareness and discussion about air pollution in China. Online stores are flooded with anti-pollution products; chat rooms and coffee shop conversations are filled with personal comments about their adventures with masks. Even in convenience stores such as 7-11 you can now find a big display of pollution masks stamped with N95, 99% or something similarly impressive on their labels. Let’s step back from this marketing hype — is there any evidence that any of these masks really do any good? This question is deadly relevant to me and my family, as well as to the hundreds of patients and readers who have asked me this question over the years.
What is my answer? I usually tell them, as I now tell you: yes, there is evidence of benefit — sort of.
There’s no medical doubt that smaller particles — the ones smaller than 2.5 microns (called PM2.5) — cause major inflammatory damage that leads to heart disease, lung disease and cancers. Quite a few studies have also shown encouraging results that lowering an area’s air pollution improves the health of the community, lowering ER visits and overall mortality. Lower your exposure, improve your health: yes, this seems obvious, but research is filled with assumptions that were proven wrong. Not in this case.
Let’s return to the masks. Construction sites all over the world can be filled with dust, heavy metals, and dangerous gases. These workers, for decades, have relied on protective masks made by companies such as 3M, with proven test results from independent labs that they reduce inhaled exposure by at least 95%. This is exactly what N95 means, a term we see often: an N95 mask, if officially certified by the National Institute for Occupational Safety and Health (NIOSH) in the USA, has passed the fit-test results on a human face. During this test, a person is wearing the mask for about 15 minutes, moving around in many positions, with the mask attached to special machines that record the concentration inside and outside the mask. If the air inside the mask is more than 95% reduced in particles, that mask passes the N95 test. Quite a few masks have this certification, and it’s for this exact reason that I am sure that these same masks can dramatically decrease all of our exposure to air pollution’s most dangerous particles, those PM0.3-PM2.5.
The main problem is jumping to the next level of assumptions — that by wearing the masks, you can improve your health. Yes, again this seems logical, but to date no studies have been done which follow such mask-wearers over months and years, testing their health and looking for improvements. Most likely these tests may never be done, unless a governmental agency such as the NIH pays for it. So in the face of lack of terrific data, the best data we have are a pair of short term studies from the same team of researchers, using subjects walking around the streets right here in Beijing. These researchers, from Cambridge as well as Beijing, first tested s couple dozen healthy young subjects and had them walk around the side streets around Second Ring Road, one of our many notoriously congested highways. When they wore a mask (the 3M 8812 model), they had a large improvement in blood pressure, 7 points on the scale.
But their follow up study, published last year in Environmental Health Perspectives, was much more relevant for me, as a family doctor. This time they tested people who already had heart disease — stable, but on medicines. Almost 100 people were tested this time, both with and without the same 3M mask for more than 24 hours. With the mask on, they showed improvement in heart rate variability, blood pressure, and stress markers for ischemia. All of these are considered risk factors for heart disease problems such as heart attacks and strokes, so any improvement in this objective data could have a major positive impact.
Why is this so important? Because air pollution doesn’t just cause lung problems, it causes heart attacks and chest pain, and strokes. And besides small children, I’m most worried about older people with heart disease, and this study proves that wearing a mask on those super bad pollution days just may save their life, preventing a heart attack.
These studies do have their flaws, especially their admitted fact that the control group wasn’t wearing a “placebo” mask, and perhaps the reported benefits are partly psychological as the subjects maybe were more relaxed while wearing the mask. But these are the best studies we have so far on the subject of masks, and I certainly am not going to wait around for better designed studies. I’m quite convinced that the underlying principle is quite robust and well proven: that decreasing exposure to air pollution improves your health. And we already know, from decades of construction work use, that N95-rated masks are designed exactly to decrease PM2.5 exposure, and that this PM2.5 is currently considered the most dangerous of the many harmful chemicals in the air.
What more does one need to know?
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