Meghan Hodges
The Bay Area has been affected by poor air quality due to factors such as wildfires, leading to a demand for protective masks. During the 2018 Camp Fire, companies like Cloudflare and Carbon Health provided free masks to employees and the public. The effectiveness of a mask depends on its seal and ability to filter out fine particles. N95, KN95, and FFP2 masks are recommended for protection against particle pollution and infectious aerosols. These masks can filter out particles down to the 2.5-micron level. However, masks with exhaust valves may release respiratory aerosols into the air, potentially spreading infections. It is important to ensure a proper fit to avoid leaks and maximize protection.
Characteristics and values of masks that work for Bay Area pollution
| Characteristics | Values |
|---|---|
| Mask type | KN95, FFP2, N95, N90, N99 |
| Effectiveness | Blocks 90-99% of fine particles (down to 0.3 microns) |
| Seal | Suctions the mask to the face during inhalation |
| Breathability | Reduces tightness or difficulty breathing |
| Exhaust valves | Improve breathability and moisture reduction but emit exhaled respiratory aerosols |
| Fit | Should be tight-fitting to prevent inflow of air |
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What You'll Learn
- N95, KN95, and FFP2 masks are effective against particle pollution
- Masks with valves reduce moisture but emit respiratory aerosols
- Masks are recommended in shared spaces like offices and classrooms
- A good seal suctions the mask to your face during inhalation
- Avoid outdoor sports or events during poor air quality
N95, KN95, and FFP2 masks are effective against particle pollution
N95, KN95, and FFP2 masks are highly effective against particle pollution. These masks are commonly used to protect against air pollution and are widely available and affordable.
The N95 mask is a commonly used pollution mask that blocks 95% of fine particles. The "N" in its name means that it is not resistant to oil, and the number 95 indicates its ability to filter out 95% of particles. Other masks in this category include the N90, which blocks 90% of fine particles, and the valved N90 and N95. The N95 mask is highly effective in protecting against both wildfire smoke particles and viruses, which can cause significant health issues when they reach deep into the lungs.
KN95 masks are also highly effective against particle pollution, and are equivalent to the N95 standard for particles down to 0.3 microns. These masks are commonly recommended for protection against wildfire smoke due to their high filtration efficiency.
FFP2 masks are another highly effective option for protection against particle pollution. FFP2 masks are similar to N95 masks in terms of filtration effectiveness, with FFP2 masks following the European EN 149 standard and requiring the filtration of at least 94% of airborne particles. FFP2 masks have been found to have the highest performance among surgical, FFP2, and N95 masks in protecting against dust contamination.
The key to the effectiveness of these masks is their seal. A good seal suctions the mask to the wearer's face during inhalation, preventing particles from leaking in or out and protecting the wearer and those around them. It is important to note that valves on masks, while helping with breathability and moisture reduction, can emit exhaled respiratory aerosols and potentially spread infected particles.
Overall, N95, KN95, and FFP2 masks are highly recommended for protection against particle pollution and airborne infections, especially when combined with other measures such as social distancing.
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Masks with valves reduce moisture but emit respiratory aerosols
While N95 pollution masks and KN95 masks with exhaust valves can help with breathability and moisture reduction, these valves will emit exhaled respiratory aerosols when you breathe out. This can also release infected respiratory aerosols into the air, putting those around you at greater risk for airborne infections. Even if you’re asymptomatic or vaccinated against COVID-19, you can still spread infected particles this way.
N95 masks are certified to filter out 95% of harmful particulate matter. The 3M 8511 N95 Cool Flow Valve Particulate Respirator stood out in tests as the most comfortable respirator mask for long-term wear, as its design gave space to breathe and didn't push against the cheeks. The exhalation valve works as a dehumidifier, keeping your face cooler and reducing the chance of fogging up glasses. The 3M 6502QL/49489 Rugged Comfort Quick Latch Half Facepiece Reusable Respirator is another comfortable and widely available option.
KN95 masks are also effective at filtering out wildfire smoke, although N95 masks may offer slightly more protection due to their tighter seals. The IQAir Mask is a KN95-certified air pollution mask that filters 95% of particles down to 0.3 microns.
The key to any mask’s effectiveness is the seal. A good seal suctions the mask to your face during inhalation. For flexible, disposable masks, this suction should be visible, causing the paper to bend inwards and create a concave surface. For masks with a firm plastic construction, you should be able to prevent the inflow of air by covering the filters with your palm.
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Masks are recommended in shared spaces like offices and classrooms
Masks are highly effective against air pollution and in environments with a high risk of exposure to harmful airborne infections, such as shared office spaces, classrooms, and public places. When it comes to protecting yourself from particle pollution or airborne infectious aerosols, a KN95, FFP2, or N95 pollution mask is recommended. These masks are rated according to the percentage of fine particles they can block; for instance, an N95 mask blocks 95% of fine particles.
However, it's important to note that masks with exhaust valves, like the N95 and KN95, can emit exhaled respiratory aerosols when the wearer breathes out, potentially spreading infected particles. Therefore, it's crucial to consider the context and choose a mask suitable for the specific environment.
In shared indoor spaces like offices and classrooms, masks are recommended to prevent the spread of illnesses and protect those around you. This is especially important during cold and flu season, when the risk of catching a cold or flu increases significantly. With people working in close proximity, it is easy for germs to spread, and masks act as a protective barrier against respiratory droplets.
Some universities and workplaces have implemented mandatory mask policies for indoor spaces, including classrooms, offices, common areas, and public spaces. These policies aim to ensure the safety and well-being of students, staff, and visitors. It is important to follow the specific guidelines and requirements of your workplace or educational institution regarding mask-wearing.
Additionally, it's worth noting that the personal protective equipment industry is working to create standardized labels for masks, indicating their level of protection. This initiative aims to provide consumers with clarity when choosing masks to protect themselves and those around them.
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A good seal suctions the mask to your face during inhalation
The key to a mask's effectiveness is its seal. A good seal suctions the mask to your face during inhalation, preventing air leaks and protecting you from harmful particles and aerosols.
To achieve a good seal, the mask should cover the bridge of the nose, the two malar eminences, and the lower lip. The mask should fit the contours of your face, with adjustable straps that provide an airtight seal around your nose and chin. This prevents leakage and ensures that particles are not inhaled through gaps in the mask.
For flexible, disposable masks, the suction should be visible, causing the paper to bend inwards and create a concave surface. For masks made of firm plastic, you can test the seal by covering the filters with your palm and ensuring no air is flowing in.
The proper size of the mask is also critical to achieving a good seal. The mask should just cover the space between the bridge of the nose and the crease in the chin. A mask that is too small or too large will not seal properly, allowing air to escape and rendering the mask ineffective.
To apply the mask, you can use the "C-E" grip technique. Place the third, fourth, and fifth fingers under the mandible and pull upward, while the thumbs and second fingers create a "C" and press down against the mask. This technique helps to maintain a proper seal and minimize fatigue.
A good seal is essential for ensuring the effectiveness of the mask in protecting against air pollution and infectious particles.
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Avoid outdoor sports or events during poor air quality
If you live in the Bay Area, you may be no stranger to poor air quality due to smoke from wildfires. During these times, it is best to avoid outdoor sports or events.
Exercising in poor air quality can lead to negative health effects, and the risk of these effects increases as the AQI (Air Quality Index) level increases. The Centers for Disease Control and Prevention suggest making physical activity less intense and shortening the duration of the workout. If you have asthma, it is urged that you keep your inhaler on you at all times during times of poor air quality.
If you do decide to engage in outdoor sports or events during poor air quality, it is recommended that you wear a tight-fitting mask. However, it is important to note that not all masks are equal in terms of effectiveness against harmful particles. Masks with a rating of N90, N95, or N99 are designed to block 90%, 95%, and 99% of fine particles, respectively. KN95, FFP2, and N95 masks are also effective against particle pollution and airborne infectious aerosols. The key to any mask's effectiveness is the seal, which should suction the mask to your face during inhalation.
During times of poor air quality in the Bay Area, some companies have given away free masks to the public. For example, during the Camp Fire in 2021, Kelly-Moore Paint stores in Northern California and Starbucks locations gave away free masks.
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Frequently asked questions
N95, KN95, and FFP2 masks are effective against particle pollution and airborne infectious aerosols.
A good seal that suctions the air quality mask to your face during inhalation.
Avoid exercising outside, refrain from driving, and stay indoors in airtight spaces with central air filtration.
Yes, masks with exhaust valves emit exhaled respiratory aerosols when you breathe out, which can spread infected particles and put those around you at risk for airborne infections.
