Air purifier guides
Plain answers to the questions people ask before and after buying an air purifier.
Is an air purifier worth it during smog?
During smog season many families in Pakistan ask whether an air purifier is worth buying. The honest answer depends on what you…
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How to choose an air purifier by room size
The most useful number when picking an air purifier is the size of the room it will run in. Here is how…
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What is CADR in an air purifier?
CADR is the number on an air purifier's box that tells you how much clean air it delivers. Here is what it…
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HEPA 13 and other filter grades explained
Air purifier filters are sold as HEPA 13, H14, E12 and more. These grades come from the European standard EN 1822. Here…
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How much electricity does an air purifier use?
An air purifier often runs for many hours a day, so it is fair to ask what it adds to your electricity…
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How often should you change a HEPA filter?
A HEPA filter traps particles rather than destroying them, so it slowly fills up. As it fills, the purifier moves less clean…
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Smog in Lahore: cleaner air indoors
When smog settles over Lahore, many households try to keep at least one room with cleaner air. Here are simple steps you…
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