High air pollution levels can cause chronic cough& worsen asthma–especially for children & older adults Sofia, Bulgaria, is taking action to improve air quality through our @BreatheCities initiative, delivered in partnership with @c40cities & @CleanAirFund Via @BloombergDotOrg https://t.co/tsdELV41cZ UN Biodiversity Climate Change Science on Telegram by @ClimateChangeScience A @grttme project - Other backups: @Hallotme