Kaminaljuyu (pronounced /kæminælˈhuːjuː/) is a Pre-Columbian site of the Maya civilization that was primarily occupied from 1500 BC to AD 1200. Kaminaljuyu has been described as one of the greatest of all archaeological sites in the New World by Michael Coe,[1] although its remains today – a few mounds only – are far less impressive than other Maya sites more frequented by tourists. When first mapped scientifically (by E. M. Shook over a period of decades from the 1930s on), it comprised some 200 platforms and pyramidal mounds, at least half of which were created before the end of the Preclassic period (250 AD). Debate continues about the size, scale, and degree by which, as an economic and political entity, it integrated both the immediate Valley of Guatemala and the Southern Maya area. Wikipedia
Air Quality Index. An air quality index (AQI) is a number used by government agencies [1] to communicate to the public how polluted the air currently is or how polluted it is forecast to become Wikipedia
- Chemicals ozone (O3)
- Sulphur Dioxide (SO2)
- Nitrogen Dioxide (NO2)
- Carbon Monoxide (CO)
- Particles smaller than 2.5 micrometers (PM2.5)
- Particles smaller than 10 micrometers (PM10)
Air pollution is the introduction of harmful substances including particulates and biological molecules into Earth's atmosphere. It may cause diseases, allergies or death in humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment. Human activity and natural processes can both generate air pollution. Wikipedia
Health effects
- Mortality
- Cardiovascular disease
- Lung disease
- Cancer
- Central nervous system