I bought an electronic air quality monitor last summer and since then I’ve been monitoring the pollution levels inside our apartment – and crucially in our kids’ bedroom. Before I got the monitor everything was guess work: I couldn’t tell how effective the filters were, whether they needed replacing, which size to purchase, etc.
The good news its that the Sharp air filters we’ve been using (and are readily available in India) are excellent. That said, if we kept the doors and windows open, there wouldn’t be any point in having them. I’ve found that the levels inside our apartment in south Delhi aren’t much lower than those outside. In other words, remaining inside and breathing unfiltered air doesn’t make a whole lot of difference when Delhi’s air quality is unhealthy to hazardous i.e. for the entire winter.
So here’s what I recommend, based on my own little controlled experiments. Adopt some simple – albeit tedious – practices and you can have good air quality inside the house round-the-clock – that is assuming you don’t live in a mansion, in which case you might want to think again.
Please also note the following:
NB When the levels are as consistently high as they've been over the last few months, the filters need changing every two months. It's worth noting that the full compliment of filters in my house i.e. six Sharp machines, costs 25,000 rupees.
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