The haze is back: Do you need an N95 mask? What about a surgical mask?

HOW DO I KNOW IF MY STOCKPILE OF N95 MASKS IS STILL USABLE?

“Check the expiration date indicated on the packaging,” said Dr Pang. “You should not use masks past their expiration date. The effectiveness of the masks may degrade with time.”

Also, look for visible defects such as shape deformities or tears. “The elastic bands should have good elasticity without snapping easily. The metal nose bridge should be in good condition. These are important for achieving a good mask seal,” said Dr Pang.

Next, do a fit check by placing the N95 mask on your face. “Feel for air leakage from the edges of the mask while breathing in and out,” she said.

“If you are still unsure of your N95 mask’s condition, consider consulting with your doctor or nurse. They can assess the masks and advise on their usability.”

WHAT IF I HAVE RESPIRATORY ISSUES AND FIND IT HARD TO BREATHE WITH THE N95 MASK?

Check with your doctor for personalised advice on whether you should wear an N95 mask if you have difficulty breathing at rest or on exertion, said Adj Assoc Prof Kee. The same thing applies if you’re an older adult, pregnant or suffer from severe lung or heart problems.

Other than that, your best alternative is to stay indoors during periods of very unhealthy or hazardous air quality, said Dr Pang.

“If you need to be outdoors, avoid strenuous activities or minimise the duration of the outdoor activity,” she said. “Continue with the treatment prescribed for your respiratory condition. If you still feel unwell or develop respiratory symptoms, you should seek medical attention promptly.”

But rather than risk it, it’s best to stay indoors and limit outdoor activities until the haze situation improves, said Adj Assoc Prof Kee.