Science and nature enthusiasts have sent OPAL more than 50,000 records about the state of our environment, from the soils under our feet to the skies above us.
They include results for our seven national surveys, and thousands of contrail observations submitted as part of our climate survey.
The milestone has been reached just over four years since our first survey, looking at soil and earthworms, was launched in March 2009.
The data is helping scientists track the spread of insect species, understand more about our climate, examine the health of our trees, and build a picture of air, water and soil quality across England and beyond.
And we still need you to keep sending in your results. From tiny ants to mighty Oaks, there’s something to interest everyone in our surveys.