Global Insights
Virus outbreaks, pollution explainers and live environmental news from around the world.
Smart Virus Outbreak Detection
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Pollutant Explainer
PM2.5
Fine Particulate Matter
WHO limit
5 µg/m³
annual mean
Tiny particles that penetrate deep into lungs and bloodstream, from combustion and dust.
PM10
Coarse Particulate Matter
WHO limit
15 µg/m³
annual mean
Inhalable particles from dust, pollen and construction; irritate airways.
NO₂
Nitrogen Dioxide
WHO limit
10 µg/m³
annual mean
From vehicle exhaust and power plants; worsens asthma and reduces lung function.
O₃
Ground-level Ozone
WHO limit
60 µg/m³
peak season mean
Formed when sunlight reacts with pollutants; triggers chest pain and coughing.
SO₂
Sulfur Dioxide
WHO limit
40 µg/m³
24-hour mean
From burning fossil fuels; irritates eyes, nose and throat.
CO
Carbon Monoxide
WHO limit
4 mg/m³
24-hour mean
Odorless gas from incomplete combustion; reduces oxygen delivery in the body.
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