Paris mayor readies for new pollution spike

On the eve of a new spike in pollution, Paris mayor Anne Hidalgo demanded Tuesday that the government draw up measures to manage the situation, including convening a crisis group.

Paris mayor Anne Hidalgo and Jean-Paul Huchon, president of the Ile-de-France region, said plans to avoid the “misunderstandings” in the management of the last spike in pollution needed to be put in place immediately.

They called for co-ordinated action between the state, the city of Paris and the region. Measures such as “alternating traffic” and making public transport free require state authorisation.

Ecology minister Ségolène Royal also joined the call for preparedness, saying that she had asked the prefect to “bring together elected officials” from the region for a meeting on Wednesday morning, adding thatChanges in tissue concentration of prostaglandins during endochondral bone differentiation.
Prostaglandins are known to be involved in bone metabolism as evidenced by the ability of PGE2 to induce bone resorption. It was, therefore, of interest to determine if there was an association of specific prostaglandin metabolites with the various stages of developing bone by utilizing the matrix-induced endochondral bone formation system. During mesenchymal cell proliferation a peak of endogenous thromboxane B2 was detected. In the subsequent stages of chondrogenesis and chondrolysis PGF2 alpha was in high concentration, whereas during bone formation PGE2, 6-Keto-PGF1 alpha and thromboxane B2 were elevated. These changes in the peak levels of the various prostaglandin metabolites may reflect differences in the cell populations and function associated with various stages of endochondral bone formation.