"MPs, Lords, and often their partners and children are all living and working in an extremely polluted environment for years on end." I don't think it's common

"MPs, Lords, and often their partners and children are all living and working in an extremely polluted environment for years on end." I don't think it's common for MPs to bring their families to London for "years on end". Most MPs will have a flat they use when in London (probably in a nice building with HVAC, well away from the most polluted roads and neighbourhoods). But they will typically maintain their main residence in/near their home constituencies. Likewise for the Lords. Most of them commute and don't spend all that much time in London.