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Cars Tyre emissions 1,000 times WORSE than exhausts

01:45  31 january  2020
01:45  31 january  2020 Source:   motoringresearch.com

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a person standing in front of a car: Tyre emissions can be 1,000 times those allowed from exhausts © Provided by Motoring Research Tyre emissions can be 1,000 times those allowed from exhausts

With modern diesel exhaust emissions lower than ever, attention is turning to other forms of pollution. More specifically, tyre wear.

According to Emissions Analytics, tyres are a major contributor to arguably the biggest source of pollutant emissions from cars today: non-exhaust sources.

This is dust and particulates that are emitted from our tyres constantly – and our brakes when we use them. This currently unregulated source of pollution contributes to particulates in the air, as well as microplastics in the ocean.

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Excessive tyre emissions: theory and testing a car parked on the side of a road: Tyre emissions can be 1,000 times those allowed from exhausts © Provided by Motoring Research Tyre emissions can be 1,000 times those allowed from exhausts

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The UK Government’s Air Quality Expert Group recently concluded that “non-exhaust emissions are recognised as a source of ambient concentrations of airborne particulate matter, even for vehicles with zero exhaust emissions of particles”.

Emissions Analytics theorised that, based on 1.5kgs of mass being lost per tyre over a 30,000-mile life, a car emits 200 milligrams of tyre particulate matter every kilometre. At that level, tyre emissions would be 22 times higher than the permitted levels in current exhaust gas regulations, which are 4.5mg/km.

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Performing Emissions Testing in Massachusetts. The Massachusetts Registry for Motor Vehicles (RMV) recommends that vehicle owners get their vehicle tested during the first half of the month in order to avoid long lines and wait times that typically occur during the latter part of the month.

In testing, it stacked the odds up in case practice yielded immeasurably low results. Low quality tyres, high speeds, intense cornering, high load in the car and a poor surface quality, were intended to help produce a measurable result. The results were shocking – 5.8 grams per kilometre lost. That’s 29 times the hypothesised result, and more than 1,000-times the allowed particulate emissions from an exhaust pipe.

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a close up of a car: Tyre emissions can be 1,000 times those allowed from exhausts © Provided by Motoring Research Tyre emissions can be 1,000 times those allowed from exhausts

This is a worst-case scenario, though many real-world factors weren’t influencers. The tyres were appropriately inflated, whereas many aren’t in the ‘real world’. Surface quality varies from good to bad. Speed limits are often broken and, of course, budget tyres are a commonplace cost-saving measure made by motorists, against expert recommendations.

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First - time residents transferring their out-of-state title, or residents transferring a vehicle title must present the vehicle’s VIR when applying for a title transfer. All emissions control equipment in the vehicle works properly, there are no signs of equipment tampering, or of equipment getting uninstalled.

The best time to get a vehicle emissions test is during the middle two weeks of the month during the early morning or in the evening. Tennessee vehicle owners may want to get their vehicles tested as soon as they receive their first testing notice. Allow extra time to get any needed repairs done before

Much of what comes off our tyres are comparatively large chunks, compared with the ultrafine ‘soot’ that comes from exhausts. PM10 or above, up to 10,000nm in size, is however joined by particles down to 10nm, due to the heat generated by tyres when in use. For reference, tailpipe emissions are described as ‘mostly below 100nm’. Regardless, even including larger chunks, the resulting pollution is both ground and watercourse-based microplastics (the larger bits) and fine particles that comprise air quality.

These results are worrying, in a world where heavy SUVs are proliferating on ever-more aggressively-worked tyres that are growing in size by the year. It’s Emissions Analytics’ belief that tyres won’t be unregulated for too much longer.

The post Tyre emissions 1,000 times WORSE than exhausts appeared first on Motoring Research.

Air pollution falls amid coronavirus lockdowns .
As the world's workers stay home during the coronavirus crisis over the course of the last month, major percentage drops in emissions levels have been noted . The European Environment Agency (EEA) has now published data from recent weeks on nitrogen oxide (NOx) concentrations. This is backed up with imagery from the Royal Netherlands Meteorological Institute (KNMI). Images are from the Copernicus Sentinel-5P satellite which has been monitoring NOx levels in Europe.

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