Air quality benefits from Mideast strife
Satellite data show conflicts, boycotts and related mass migration have cut atmospheric pollutants in areas.
The political turmoil in the Middle East is so dramatic that scientists say they can see it from space.
Satellite data from the region reveal marked drops in atmospheric pollutants that can’t be linked to cleanair laws or other policy changes, according to a new study. However, the pollution trends are often right in line with armed conflicts and the resulting movement of refugees.
Reductions in the levels of nitrogen oxide and sulfur dioxide contain clear signatures of the civil war in Syria, incursions by the militant group Islamic State into major Iraqi cities, and the international community’s economic sanctions against Iran.
The cleaner air is the result of “international boycotts, armed conflict and related mass migration of people,” said study leader Jos Lelieveld, director of the atmospheric chemistry department at the Max Planck Institute for Chemistry in Mainz, Germany.
Lelieveld and his colleagues looked at 10 years of measurements taken by the Ozone Monitoring Instrument on NASA’s Aura spacecraft, which is studying Earth’s atmosphere. Nitrogen oxide and sulfur dioxide degrade the air and contribute to climate change, Lelieveld said.
Previous studies have estimated that 58% of nitrous oxide emissions are a byproduct of burning fossil fuels, mainly from generating power and traffic-related pollution. That figure is higher in the Middle East, where fossil fuels are plentiful. So the researchers thought the level of emissions there would provide a decent proxy of the economic activity in the region.
And that’s what they found, in some places.
In Saudi Arabia, for instance, nitrous oxide emissions rose in line with general energy consumption from 2005 to 2010. After that, energy consumption continued to rise while nitrous oxide emissions fell. That’s probably the result of laws passed in 2008 aimed at reducing the country’s environmental footprint, the researchers wrote in their study, published Friday in the journal Science Advances.
The story was similar in Kuwait and the United Arab Emirates, which implemented air quality standards in the late 2000s. Together, these findings “provide a first indication that air quality control” in the Persian Gulf states is working, the study authors wrote.
To the northwest, the atmosphere over the Israeli cities of Tel Aviv and Haifa became cleaner in the years after that country’s Clean Air Law went into effect in 2011. Though economic activity and energy consumption rose, nitrous oxide emissions “decreased substantially,” the report says.
Elsewhere in the Middle East, the explanation for declining emissions was far less benign.
Nitrous oxide pollution has plunged 40% over Damascus and 50% over Aleppo since 2011, when “Arab Spring” protests reached Syria, and later escalated into a civil war that has killed more than 220,000 people, according to the United Nations.
Meanwhile, emissions rose in parts of Lebanon despite a decrease in economic activity. That’s probably because 1.2 million Syrians flowed into the country, the study authors wrote. Jordan, which took in about 625,000 Syrian refugees, also saw a large increase in nitrous oxide emissions.
Similarly, emissions in parts of Iraq have declined since 2013 in places such as Tikrit and Samarra after they were occupied by Islamic State, the report says. Emissions have also dropped in Baghdad, the capital, which has weathered a series of deadly attacks but remained out of the hands of Islamic State.
Emissions over Egypt provide a clue of the government change that occurred in 2011. Although carbon dioxide emissions held steady, nitrous oxide emissions fell. The report says that higher fuel prices probably forced Egyptians to cut back on driving, resulting in cleaner air. This change, they wrote, “was driven by political events.”
The emissions data also show that economic sanctions imposed on Iran in 2006 didn’t have much effect until they were extended in 2010. Only then did the economy begin to slow, then shrink, resulting in a drop in energy use. Most strikingly, the researchers wrote, a 50% drop in oil exports since 2010 reduced sulfur dioxide emissions over the Persian Gulf, “in particular near the main Iranian oil tanker terminal Jazireh Ye at Kharg Island.”
Lelieveld said he didn’t expect to find clues that some parts of the Middle East have “completely gotten out of control” by looking at the atmosphere. “That you can see these things from air pollution was to me a really big surprise,” he said.
Normally, cleaner air would be something to celebrate. But in this case, they study authors concluded, “it is tragic” that some of the improvements “are associated with humanitarian catastrophes.”