As a thick, grey haze blankets Delhi this November, reaching for a mask feels like second nature. But simply wearing one isn't enough. A poorly fitted mask offers a false sense of security when the air outside is a risk to your health.
Delhi's Ongoing Air Quality Emergency
Delhi's air quality
has once again plunged into the 'Very Poor' category in mid-November, with the Air Quality Index (AQI) consistently crossing the 300 mark. On November 11, the city's average AQI was recorded at 313, and some monitoring stations have even reported 'Severe' levels, with readings over 400. Health advisories from government bodies are urging residents, especially vulnerable groups like children, the elderly, and those with heart or lung conditions, to avoid outdoor activities. When stepping out is unavoidable, the official recommendation is clear: wear an N95 mask. The primary culprit behind this health alert is PM2.5—microscopic particulate matter that can penetrate deep into the lungs and enter the bloodstream, causing a host of health issues.
Not All Masks Are Created Equal
During pollution spikes, many people turn to convenient cloth or standard surgical masks. While better than nothing, they offer minimal protection against PM2.5. The pores in cloth masks are simply too large to filter these tiny, harmful particles, and their loose fit allows polluted air to leak in around the sides. Studies show that cloth masks may only filter 10% to 30% of PM2.5 particles. In contrast, a certified N95 respirator is engineered from a mesh of synthetic fibres with an electrostatic charge that can trap at least 95% of airborne particles as small as 0.3 microns. This makes them the superior choice for protection against the toxic smog currently blanketing the city.
Why the Fit Is More Important Than the Filter
The '95' in N95 only applies if the mask forms a perfect seal against your face. If there are gaps around your nose, cheeks, or chin, you are breathing in unfiltered air, completely bypassing the mask's advanced filtration technology. This is why a proper fit is not just a suggestion but a requirement for the mask to be effective. A loose N95 may not be much better than a cloth mask. Factors like facial hair, glasses, or even using the wrong size can easily compromise the seal. Taking a moment to ensure your mask is sealed correctly is the most critical step in protecting your lungs.
Your Step-byStep Guide to a Proper Seal Check
Every time you put on an N95, you must perform a user seal check. First, place the respirator under your chin with the nosepiece up. Pull the top strap over your head so it rests high on the back of your head; then pull the bottom strap over and position it around your neck, below your ears. Do not crisscross the straps. Next, use the fingertips of both hands to mould the metal nosepiece to the shape of your nose bridge. Now, perform the check: 1. Positive Pressure Check: Place your hands over the mask, covering as much surface as possible, and exhale gently. The mask should bulge slightly, and you should not feel any air leaking out from the edges. If you wear glasses and they fog up, you do not have a good seal. 2. Negative Pressure Check: Place your hands over the mask again and inhale sharply. The mask should collapse slightly inward toward your face. If it does, and you don't feel air leaking in, the seal is good. If you feel any leaks during these checks, readjust the mask's position and the straps and try again.
Common Mistakes and How to Avoid Them
Achieving a perfect seal can be tricky. One of the biggest obstacles is facial hair; even a day's stubble can prevent the mask from sealing properly. For an N95 to work as intended, the wearer must be cleanshaven where the mask touches the skin. Another common error is pinching the nosepiece with one hand, which can create a sharp peak rather than a contoured seal. Always use both hands to mould the strip to your nose. Finally, remember that N95s cannot be washed as water destroys their electrostatic charge. They should be replaced when they become dirty, damaged, or the straps lose their elasticity.
