Exaggerating how much lockdown improved air quality could allow us to underestimate the scale of the air pollution problem.

Some atmospheric pollutants actually help cool the planet, but the sudden shutdown of heavy industry threatened to purge them.

One in five now work exclusively from home in the UK. But remote workers still drive about as often as commuters – though for different reasons.

Without plastic shielding between seats or more efficient engines, the environmental benefits of public transport are lost.

As lockdowns have came into effect around the world, air pollution has plummeted.