'unfavourable atmosphere' is a correct phrase in written English, and it is usually used to refer to a situation in which people do not feel comfortable or safe.
For example, "The unfavourable atmosphere at the company meeting made it difficult for attendees to express their opinions."
And it has been introduced in the most unfavourable circumstances imaginable: in an atmosphere of confusion and bitterness.
But the sense of confidence conferred on the industrial class through the industrial and transportation revolutions of the 19th century, especially in Britain and the United States, produced an atmosphere that was unfavourable to government intervention.
Possible reasons for this decrease, such as effects of pH on the subsoil microbial community, a higher sensitivity of fungi to the absence of fresh organic matter or to an unfavourable composition of the subsoil atmosphere, need further investigations.
Spirited and successful as Averroës' defense was, it could not restore philosophy to its former position, quite apart from the fact that the atmosphere in Muslim Spain and North Africa was most unfavourable to the unhindered pursuit of speculation.
Anodising and sealing prevents localised corrosion — which is characteristic of aluminium in marine or industrial atmospheres — even in the most unfavourable situations, except in the case of 7 μm films, the lowest thickness tested.
Themes that emerged from the focus groups were perceived learning effects, the tutor's background and role, the peer CME groups' structure and atmosphere, the experience of receiving and discussing feedback reports, explanations for an unfavourable prescribing profile.
Noninfectious plant diseases are caused by unfavourable growing conditions, including extremes of temperature, disadvantageous relationships between moisture and oxygen, toxic substances in the soil or atmosphere, and an excess or deficiency of an essential mineral.
An unfavourable polling result, perhaps.
Unfavourable stories invite libel suits.
Questions abounded, generally with unfavourable instinctive responses.
