Paris Suffers Worst Air Pollution in 10 Years, Limits Cars and Makes Public Transit Free
For the third day in a row, air pollution blanketed Paris, which authorities called the worst bout for at least 10 years. The city imposed driving restrictions and made public transit free.
#Paris aujourd'hui. La preuve de la nécessité de réduire la place de la voiture en centre-ville #pollution https://t.co/R10Tdu4o2Y— Anne Hidalgo (@Anne Hidalgo)1481035096.0
Unusually calm air failed to disperse vehicle emissions and particulates from wood fires, creating conditions that have veiled the Eiffel Tower in a gray haze.
Paris has instituted a system based on alternating odd or even license plate numbers to ban certain vehicles from city streets, effectively cutting traffic in half each day. This is just the fourth time in 20 years that Paris has taken this step, and the first time it has been in place for consecutive days.
"Cars are poisoning the air," Paris city hall transport official Herve Levife told Reuters. "We need to take preventive measures."
"We want these bans to automatically take effect when the pollution exceeds a certain level, not have to negotiate them with the government each time," Levife added.
#Paris Goes Car-Free First Sunday of Every Month https://t.co/NOd8Lc5qdt @ClimateReality @sierraclub @Greenpeace https://t.co/xmUwjLRsLx— EcoWatch (@EcoWatch)1463503788.0
More than 1,700 drivers were issued tickets for violating the ban on Tuesday, which carries a fine of 35 Euros, or about $37.42. Hybrid and battery electric vehicles, as well as those carrying three or more passengers, are exempt.
All public transit was made free, putting a strain on commuter systems as crowds piled onto trains and buses. The city's bike-share system was also free to use.
Along with Paris, the French cities of Lyons and Villeurbanne were expected to impose similar measures.
Air quality index readings reached or exceeded 150 on Thursday, considered a "critical" level.Air Pollution in Paris: Real-time Air Quality Index Visual Map
Readings of particulate matter exceeded 80 micrograms per cubic meter. The European Union has set a maximum daily average of 50. Particulate matter, due to its small size, can be inhaled deeply into lungs. High exposure can cause asthma, lung cancer, cardiovascular disease, respiratory diseases, birth defects and premature death.
Beginning July 1, Paris banned all cars 20 years or older. Longer-term, Paris and three other cities—Athens, Madrid and Mexico City—will ban diesel engines by 2025 as announced earlier this week. Diesels area major emitter of particulate matter pollution.
In March 2015, the air quality index in Paris briefly made it the worst polluted city in the world.
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By Katherine Kornei
Clear-cutting a forest is relatively easy—just pick a tree and start chopping. But there are benefits to more sophisticated forest management. One technique—which involves repeatedly harvesting smaller trees every 30 or so years but leaving an upper story of larger trees for longer periods (60, 90, or 120 years)—ensures a steady supply of both firewood and construction timber.
A Pattern in the Rings<p>The <a href="https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/coppice-standards-0" target="_blank">coppice-with-standards</a> management practice produces a two-story forest, said <a href="https://www.researchgate.net/profile/Bernhard_Muigg" target="_blank">Bernhard Muigg</a>, a dendrochronologist at the University of Freiburg in Germany. "You have an upper story of single trees that are allowed to grow for several understory generations."</p><p>That arrangement imprints a characteristic tree ring pattern in a forest's upper story trees (the "standards"): thick rings indicative of heavy growth, which show up at regular intervals as the surrounding smaller trees are cut down. "The trees are growing faster," said Muigg. "You can really see it with your naked eye."</p><p>Muigg and his collaborators characterized that <a href="https://ltrr.arizona.edu/about/treerings" target="_blank">dendrochronological pattern</a> in 161 oak trees growing in central Germany, one of the few remaining sites in Europe with actively managed coppice-with-standards forests. They found up to nine cycles of heavy growth in the trees, the oldest of which was planted in 1761. The researchers then turned to a historical data set — more than 2,000 oak <a href="https://eos.org/articles/podcast-discovering-europes-history-through-its-timbers" target="_blank" rel="noopener noreferrer">timbers from buildings and archaeological sites</a> in Germany and France dating from between 300 and 2015 — to look for a similar pattern.</p>
A Gap of 500 Years<p>The team found wood with the characteristic coppice-with-standards tree ring pattern dating to as early as the 6th century. That was a surprise, Muigg and his colleagues concluded, because the first mention of this forest management practice in historical documents occurred only roughly 500 years later, in the 13th century.</p><p>It's probable that forest management practices were not well documented prior to the High Middle Ages (1000–1250), the researchers suggested. "Forests are mainly mentioned in the context of royal hunting interests or donations," said Muigg. Dendrochronological studies are particularly important because they can reveal information not captured by a sparse historical record, he added.</p><p>These results were <a href="https://www.nature.com/articles/s41598-020-78933-8" target="_blank">published in December in <em>Scientific Reports</em></a>.</p><p>"It's nice to see the longevity and the history of coppice-with-standards," said <a href="https://www.teagasc.ie/contact/staff-directory/s/ian-short/" target="_blank">Ian Short</a>, a forestry researcher at Teagasc, the Agriculture and Food Development Authority in Ireland, not involved in the research. This technique is valuable because it promotes conservation and habitat biodiversity, Short said. "In the next 10 or 20 years, I think we'll see more coppice-with-standards coming back into production."</p><p>In the future, Muigg and his collaborators hope to analyze a larger sample of historic timbers to trace how the coppice-with-standards practice spread throughout Europe. It will be interesting to understand where this technique originated and how it propagated, said Muigg, and there are plenty of old pieces of wood waiting to be analyzed. "There [are] tons of dendrochronological data."</p><p><em><a href="mailto:email@example.com" target="_blank" rel="noopener noreferrer">Katherine Kornei</a> is a freelance science journalist covering Earth and space science. Her bylines frequently appear in Eos, Science, and The New York Times. Katherine holds a Ph.D. in astronomy from the University of California, Los Angeles.</em></p><p><em>This story originally appeared in <a href="https://eos.org/articles/tree-rings-reveal-how-ancient-forests-were-managed" target="_blank">Eos</a></em> <em>and is republished here as part of Covering Climate Now, a global journalism collaboration strengthening coverage of the climate story.</em></p>
Earth's ice is melting 57 percent faster than in the 1990s and the world has lost more than 28 trillion tons of ice since 1994, research published Monday in The Cryosphere shows.
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Noreen Nunez lives in a middle-class neighborhood that rises up a hillside in Trinidad's Tunapuna-Piarco region.