“I'm worried about the impact it's having on my toddlers' lungs. I hope they don't become asthmatic.” — Y, South West London

We live on Lavender Hill. As we step out, I wish I could hold my breath, especially during peak hours. The pollution is so bad. You can tell the difference between a quiet Sunday where the roads are less busy and a busy winter day. I've bought indoor air purifiers and have to change the filter every 4 months. When I see the filter I'm shocked. I'm worried about the impact it's having on my toddlers' lungs. I hope they don't become asthmatic.

Y, South West London