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The Cygnus region hosts the most conspicuous star-forming region close to theSun, embedded in a giant complex of molecular clouds in the Local Arm. Wepresent an analysis of the Fermi-LAT observations of Cygnus intended to probethe cosmic-ray and interstellar-matter content of the region. From gamma-raydata we estimate a total of (8 +5 -1) x 10^6 solar masses of interstellar gasin the complex at a distance of 1.4 kpc. The gamma-ray emission from the atomicgas supports the average HI spin temperature derived from radioabsorption/emission pairs to estimate its column densities. TheX(CO)=N(H2)/W(CO) ratio derived in the massive Cygnus complex is consistentwith other LAT estimates for clouds in the Local and Perseus arms. The mass ofdark gas, escaping HI and CO observations but traced by dust and gamma rays,amounts to ~10% of the total. We find an average gamma-ray emissivity perinterstellar H atom in the 0.1--100 GeV energy band in good agreement withmeasurements in other segments of the Local Arm. We infer that the cosmic-raypopulation averaged over a few hundred parsecs is fairly uniform in density andspectrum along the Local Arm. Despite the presence of potential acceleratorsand much larger interstellar densities in Cygnus compared to the solarneighborhood, their cosmic-ray populations are similar on such a scale.

The Fermi-LAT view of cosmic rays and interstellar gas in the Cygnus region: a not so special spot of the Local Arm