Bars represent average annual concentrations over a limited number of monitoring stations along busy roads in major European cities (Vienna, Prague, Paris, Berlin, Athens, Krakow, Bratislava, Stockholm and London NOX, and Prague, Copenhagen, Berlin, Reykjavik, Rome, Bratislava, Stockholm and London PM10), error bars represent the highest annual concentration measured at one single monitoring station
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Let the grass grow higher and thus encourage root growth. It will also allow the grass to self-seed. If you mow a path in the middle, it will show that it is indeed meant to be that way as opposed to being neglected.
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