Air pollution is a major environmental risk factor and responsible for scads of diseases such as asthma, lung cancer, ventricular hypertrophy, Alzheimer's and Parkinson's diseases, psychological complications, autism, retinopathy, fetal growth, and low birth weight. Environmental air pollution has been talked about in length where lobbyist bat for more machines and environmentalist fight for efficient systems. But less is spoken about the air inside our homes, in our public spaces, at our workspaces. It’s time we think about them. This post was written a few years back. We are reposting them with updated data.