All it takes to change that opinion is to spend a few winter days out in the smog-choked capital of India. That had quickly built an appreciation in me for even

All it takes to change that opinion is to spend a few winter days out in the smog-choked capital of India. That had quickly built an appreciation in me for even the current state of pollution controls in the West, where the air getting that bad is considered 'historic' (eg the Canadian wildfire smoke that passed through NY back in June).