The city can make us sick in a thousand ways, and respiratory diseases are growing vertically: apparently all that remains is to go around with the gas mask.
An alternative comes to us from Airvida, the wearable air purifier.

According to Ible, its manufacturer, this device removes up to 99.9% of allergens, pollutants and bacteria that we breathe. It is brought to neck like a hi-tech accessory (it weighs only 70 grams) and has a lithium-ion battery that holds it running for 32 hours.
The concept of "putting on airs" therefore seems to take on a completely new connotation.
Here's where to find it: https://www.breathingspace.co.uk/accessories-c6/airvida-l1-wearable-air-purifier-p221