Muni bonds are seeing yields way above average right now even as Treasury bonds linger near all-time lows. The reason why is that it is increasingly apparent that there has been a huge erosion in municipal credit quality alongside the lockdown. Costs have surged at the same time as revenues have plummeted, leading to a significantly deteriorated financial picture for municipal issuers. The has been exacerbated by the fact that municipalities have largely been unsupported by the Fed as opposed to corporate issuers. But the sell-off has created opportunity, as even AAA issuers are seeing big discounts and much higher than usual spreads to Treasuries.
FINSUM: This is all about careful credit selection, as there are big opportunities, but there may also be major pitfalls.