Urban Air Pollution
Vehicle exhaust is the source of carbon monoxide in urban environments. Smoking and combustion are the primary sources of carbon monoxide in urban environments. Cities also contain carbon dioxide produced by normal human respiration. In ci…
2 sources - 4 claims
Vehicle exhaust is the source of carbon monoxide in urban environments. Smoking and combustion are the primary sources of carbon monoxide in urban environments. Cities also contain carbon dioxide produced by normal human respiration. In cities, atmospheric carbon monoxide levels are significantly elevated during early morning hours when traffic is heaviest.