It is the biggest environmental health hazard in the world taking milions of lives. But the bigger problem is that we are quiet about this issue and accepting it as our fate. Our previous generations have failed us and there has been a lot of shout out but no solution. We need to act now. It's now or never.
If we dive deep into the problem, the main culprit is the tiny size of PM2.5. Therefore it can enter our body easily and harm. What if we can adhere these particles together such that they become heavier and fall off, and never enter our lungs. We need no replacement filters to clean our cities.